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Kristen Stewart Celebrates Birthday with Robert Pattinson at L.A. Bar

Fred Duval/FilmMagic(LOS ANGELES) -- Kristen Stewart, who turned 22 Monday, got a jumpstart on the celebration over the weekend.

The actress, her Twilight co-star and boyfriend Robert Pattinson, and 15 friends had drinks at a Los Angeles bar on Saturday night, according to E! News. A source says, "They were having lots of drinks on the top floor of the bar and seemed to be having fun."

Stewart and Pattinson stayed until 1:30 a.m., holding hands as they walked out.

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