"Masters of Sex" star Michael Sheen, who broke up with actress Rachel McAdams in February after a two-year relationship, is reportedly dating Carrie Keagan, host of VH1's "Big Morning Buzz Live."

Us Weekly said Thursday that the acclaimed Welsh film and theater actor brought Keagan to Showtime's "Masters of Sex" premiere after party, held at the Morgan Library and Museum in Manhattan on Sept. 26.

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Sheen, 44, had an eight-year relationship with actress Kate Beckinsale from 1995 until 2003; the two share daughter Lily, 14. He met McAdams while shooting Woody Allen's "Midnight in Paris" and went public with their relationship in October 2010.

Keagan, who has had small acting roles in films including "American Pie: Book of Love" and "Smokin' Aces: Assassin's Ball," accompanied writer-producer Aaron Sorkin to the Golden Globe Awards in January. Last year Keagan was named one of Us Weekly's 25 Most Stylish New Yorkers.