Michael Sheen and Rachel McAdams. (WENN.COM file photo)

Hollywood stars Rachel McAdams and Michael Sheen have ended their romance, according to a U.S. report.

The Notebook beauty began dating the Welsh actor after they played lovers in Woody Allen's romantic comedy Midnight In Paris, and they went public as a couple in October 2010.

However, a source now tells Us Weekly magazine the relationship is over.

Just last year, McAdams admitted she and Sheen had racked up "a lot of air miles" flying around the world to see one another.

She told The Sunday Telegraph's Stella magazine, "Michael and I never spend more than three weeks apart - we rack up a lot of air miles - but you have to be quite adaptable in this business whether you are in a relationship or not."

Representatives for the stars had yet to comment on the report as WENN went to press.

McAdams was previously engaged to Ryan Gosling, while Sheen had an eight-year relationship with British actress Kate Beckinsale, the mother of his 14-year-old daughter, Lily.