Rachel McAdams & Michael Sheen: Dublin Duo
The two were first outed as a couple back in October, when they were seen holding hands in Toronto.
Rachel, 32, and Michael, 42, reportedly first met at a party for his drama Beautiful Boy.
At the end of the year, Michael will hit the stage at the Young Vic Theatre in London to star in the title role of Hamlet.
Performances begin October 28, with an official opening on November 9 and shows running through January 2012.