Yup, it's on!
In a just-released pic, Rachel McAdams and Michael Sheen held hands during a sweet stroll in Toronto, Canada on Sunday.
It's the first time McAdams, 31, and Sheen, 41, have made their long-rumored romance public. See more pictures of the new couple.
Involved for about two months, the Canadian actress and the British Twilight Saga star were spotted making out Sept. 10 during the Toronto film festival. An insider recently told Us: "It may turn serious!"
Sheen and ex-wife Kate Beckinsdale have a daughter Lily, 11. McAdams' on-and-off romance with her The Notebook costar Ryan Gosling -- including a brief engagement -- fizzled for good in 2007.