Comedian Sarah Silverman and "Masters of Sex" star Michael Sheen were seen together at two public outings in Los Angeles last week, leading to speculation they're dating.

Us Weekly said Wednesday that Silverman 43, and Sheen, 45, arrived together for his birthday party at the West Hollywood restaurant Craig's. They later left together, with Silverman driving. The guests included Sheen's TV co-star, Lizzy Caplan, as well as Sheen's ex-partner Kate Beckinsale and her husband, director Len Wiseman.

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The following night, Sheen and Silverman were seen behaving romantically a West Hollywood nightclub, Us said.

Silverman had a five-year relationship with talk-show host Jimmy Kimmel before they broke up in July 2008. After briefly reconciling a few months later, the two split up for good. Sheen was in a relationship with Beckinsale from April 1995 until early 2003, and the pair had a daughter together in 1999. He then had a two-year relationship with his "Midnight in Paris" co-star Rachel McAdams.