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Michelle Williams and Jason Segel have finally gone public with their long-rumoured romance.
The pair made their debut as a couple as they attended an afterparty together for Jason's new film The Five Year Engagement on Wednesday night.
Although Michelle skipped the red carpet earlier in the evening, she was there to support her beau for the premiere at the Tribeca Film Festival.
A source, who spotted the pair together at the afterparty at the Museum of Modern Art in New York told Us Weekly magazine: "Michelle was really sweet but her usual shy self in crowds - she stayed close to Jason and only really engaged in conversation with people that she knew. Jason would put his arms around her waist and they gave each other a few sweet pecks - they definitely seemed to have a physical chemistry."
After the pair were recently spotted hand-in-hand near Michelle's Brooklyn home, Jason confirmed to US news show Extra: "I think we would just very much like to be happy. That's all I'm going to say about it."
Michelle was previously engaged to late actor Heath Ledger, the father of her six-year-old daughter Matilda.
IN PICS: Five-Year Engagement Premiere
Emily Blunt, Jason Segel, and Bill Hader attend 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Tribeca Film Festival co-founder Jane Rosenthal and NBC Universal President-COO Ron Meyer attend 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Elizabeth Banks attends 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Leelee Sobieski, Tribeca Film Festival co-founder Jane Rosenthal and actress Camilla Belle attend 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Judd Apatow and Robert De Niro attend 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Emily Blunt attends 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Bill Hader attends the Magnum Ice Cream hosted opening night party for the Tribeca Film Festival 2012 premiere of 'The Five Year Engagement' at MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images for Magnum Ice Cream)
Emily Blunt and comedian Kevin Hart attend 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Snowboarder Shaun White (L) and Robert De Niro attend 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Judd Apatow, Elizabeth Banks and Bill Hader attend 'The Five Year Engagement' Premiere opening night party during the 2012 Tribeca Film Festival at the MOMA on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Actress Leelee Sobieski walks the red carpet as she arrives for the showing of 'The Five-Year Engagement' which opens the 2012 Tribeca Film Festival in New York, April 18, 2012. (Photo: EMMANUEL DUNAND/AFP/Getty Images)
Jason Segel walks the red carpet as she arrives for the showing of 'The Five-Year Engagement' which opens the 2012 Tribeca Film Festival in New York, April 18, 2012. (Photo: EMMANUEL DUNAND/AFP/Getty Images)
Kim Cattrall walks the red carpet as she arrives for the showing of 'The Five-Year Engagement' which opens the 2012 Tribeca Film Festival in New York, April 18, 2012. (Photo: EMMANUEL DUNAND/AFP/Getty Images)
Olivia Wilde walks the red carpet as she arrives for the showing of 'The Five-Year Engagement' which opens the 2012 Tribeca Film Festival in New York, April 18, 2012. (Photo: EMMANUEL DUNAND/AFP/Getty Images)
Actress Emily Blunt walks the red carpet as she arrives for the showing of 'The Five-Year Engagement' which opens the 2012 Tribeca Film Festival in New York, April 18, 2012. (Photo: EMMANUEL DUNAND/AFP/Getty Images)
Brad Hall and actress Julia Louis-Dreyfus walk the red carpet at the 'The Five Year Engagement' Premiere during the 2012 Tribeca Film Festival at the Ziegfeld Theatre on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Alison Brie walks the red carpet at the 'The Five Year Engagement' Premiere during the 2012 Tribeca Film Festival at the Ziegfeld Theatre on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
Actress Dakota Johnson walks the red carpet at the 'The Five Year Engagement' Premiere during the 2012 Tribeca Film Festival at the Ziegfeld Theatre on April 18, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
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The Huffington Post UK | Posted: 20/04/2012 11:48 Updated: 20/04/2012 11:48