The Britain's Got Talent judge posed next to a 'bump' sign in LA with five-year-old daughter Lexi, excitedly pointing to the sign with one hand and resting her other over her expanding tummy.
The snap was taken on a recent family holiday to America, just before Amanda returned home and shared her happy news, five months after her second baby was stillborn at seven months.
The star, who is currently starring in Shrek the Musical, also took to Twitter to defend her choice to announce her baby news to the world, after she was criticised in the press for telling everyone so soon:
'Thankyou for your good wishes however I am VERY much over 12 wks!. Was doing my best to try & stay private about that. You win.
'I also had to 'share' the news as I am leaving Shrek early and no longer doing Matinees!I can imagine what columnists wld have made of that.'