updated 10/05/2010 AT 11:00 AM ET
•originally published 10/05/2010 AT 2:00 PM ET
Now the Canadian actress, 33 – who has starred in Mean Girls, The Wedding Crashers, The Notebook and more – is again raising eyebrows for a possible romance. She was recently seen at a Toronto Film Festival afterparty with her Midnight in Paris costar Michael Sheen, 41, who last season memorably played Tina Fey’s wannabe boyfriend on 30 Rock.
Besides the party, McAdams and Sheen also stepped out on the town – hand-in-hand – to take in art exhibits in the Canadian city. (Toronto happens to be her hometown.)