Sarah Silverman is dating Michael Sheen.

The comedienne was reportedly seen "making out" with the Frost/Nixon actor at Hollywood nightspot Soho House last Thursday, and insiders have confirmed they are now a couple. "They were making out at Soho House. They were all over each other for a lot of the night," a source said.

The pair also seemed close at Michael's 45th birthday celebrations at Craig's last week, where they joined revelers including his Masters of Sex co-star Lizzy Caplan, Nicole Richie, Kate Hudson, Demi Moore and his former partner Kate Beckinsale and her husband Len Wiseman.

"Sarah and Michael came and left together. She drove. When they left, Sarah opened her trunk so Michael could put all of his gifts in and then they drove away," a source said.

Michael - who has 14-year-old daughter Lily with Kate - briefly dated VH1 presenter Carrie Keagan last year and was in a relationship with his Midnight in Paris co-star Rachel McAdams for two years until February 2013.

Sarah was previously in a relationship with Jimmy Kimmel, but they split in 2009 after five years together.