The Duchess of Cambridge admitted she's "nervous" about giving birth as she visited a south London addiction charity on Tuesday.

The 31-year-old was chatting to a group of women recovering from drink and drug addictions at at a treatment centre run by the charity Action On Addiction of which she is patron.

The Duchess spent time with an arts therapy group at Hope House in Clapham, south London, where the centre's clients had completed paintings charting their battle with substance abuse.

duchess of cambridge kate

The Duchess of Cambridge is pictured arriving at Action on Addiction's Hope House in Clapham, South London, on Tuesday

Lisa, a mother-of-three who did not want to give her full name, said: "I did ask her if she was nervous (about giving birth). She said it would be unnatural if she wasn't - she's human like us."

The 34-year-old, who turned to drink during a violent marriage which lasted 18 years, said: "I said 'Congratulations and good luck, I hope it all goes OK'."

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Kate also chatted to Natalie, who has a two-year-old daughter and is due to give birth to a second child in July - the same month as the Duchess who is more than four months pregnant.

The 28-year-old said the talk also turned to babies when they chatted: "We're due about the same time. She's been unwell and feeling better now and I felt pretty much the same the first time."

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  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge at a reception during her visit to Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge in the art therapy group as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge at a reception during her visit to Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge listens to speeches at a reception during her visit to Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge at a reception during her visit to Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge at a reception during her visit to Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge in the art therapy group as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge in the art therapy group as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge talks to Sabrina as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge with counsellor Lou Kramer and Sabrina (right) as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge in the art therapy group as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge leaves the addiction charity's Hope House treatment centre in Clapham, South London following her visit.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge in the art therapy group as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge with (left) Susanne Hakimi, Head of Services and (right) Ms Yael Stobezki, art therapist in the art therapy group as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge with counsellor Lou Kramer and Sabrina (right) as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge leaves the addiction charity's Hope House treatment centre in Clapham, South London following her visit.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge receives flowers from Hugh and Serena Woodford as she leaves the addiction charity's Hope House treatment centre in Clapham, South London following her visit.

  • Britain's Kate, The Duchess of Cambridge leaves after a visit to Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Kirsty Wigglesworth)

  • Britain's Kate, The Duchess of Cambridge waves as she leaves after a visit to Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Kirsty Wigglesworth)

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge leaves the addiction charity's Hope House treatment centre in Clapham, South London following her visit.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge receives a bouquet of flowers as she leaves the addiction charity's Hope House treatment centre in Clapham, South London following her visit.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge leaves the addiction charity's Hope House treatment centre in Clapham, South London following her visit.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge leaves the addiction charity's Hope House treatment centre in Clapham, South London following her visit.

  • Kate, The Dutchess of Cambridge

    Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)

  • Kate, The Dutchess of Cambridge

    Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge is greeted by Nick Barton, Chief Executive of Action on Addiction as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge is greeted by Nick Barton, Chief Executive of Action on Addiction as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Kate, The Dutchess of Cambridge

    Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Kirsty Wigglesworth)

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • The Duchess Of Cambridge Visits Hope House

    LONDON, ENGLAND - FEBRUARY 19: Catherine, Duchess of Cambridge visits Hope House, an Action on Addiction women's treatment centre on February 19, 2013 in London, England. (Photo by Danny Martindale/Getty Images)

  • The Duchess Of Cambridge Visits Hope House

    LONDON, ENGLAND - FEBRUARY 19: Catherine, Duchess of Cambridge visits Hope House, an Action on Addiction women's treatment centre on February 19, 2013 in London, England. (Photo by Danny Martindale/Getty Images)

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge is greeted by Nick Barton, Chief Executive of Action on Addiction as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge is greeted by Nick Barton, Chief Executive of Action on Addiction as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Kirsty Wigglesworth)

  • Kate, The Dutchess of Cambridge

    Britain's Kate, The Duchess of Cambridge is greeted as she arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Kate, The Dutchess of Cambridge

    Britain's Kate the Duchess of Cambridge waves at members of the media and people who gathered to see her, on arrival at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)

  • Kate, The Dutchess of Cambridge

    Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Kirsty Wigglesworth)

  • Kate, The Dutchess of Cambridge

    Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Kirsty Wigglesworth)

  • Kate, The Dutchess of Cambridge

    Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)

  • The Duchess Of Cambridge Visits Hope House

    LONDON, ENGLAND - FEBRUARY 19: Catherine, Duchess of Cambridge visits Hope House, an Action on Addiction women's treatment centre on February 19, 2013 in London, England. (Photo by Danny Martindale/Getty Images)

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge as she arrives at addiction charity's Hope House treatment centre in Clapham, South London.

  • Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)

  • Duchess of Cambridge visits Hope House treatment centre in Clapham

    The Duchess of Cambridge receives a bouquet of flowers as she leaves the addiction charity's Hope House treatment centre in Clapham, South London following her visit.