Britney Spears surprised guests by showing up to the Generation Rescue autism fundraiser thrown by Jenny McCarthy. It was a surprise because everyone knows Britney hates kids, since she just gave up her own.

As guests like McCarthy’s beau and Charlie Sheen and wife Brooke Mueller made the rounds, Spears, 26, sipped on red wine.
Carrey’s daughter Jane also belted out a few Frank Sinatra and Jackson 5 tunes.
Spears, 26, “definitely looked happy,” a witness tells Usmagazine.com. “She was clapping and smiling a lot.”