Britney Spears turned up Saturday at a star-studded charity fundraiser thrown by Jenny McCarthy in Los Angeles, Us magazine reports. The pop star rubbed elbows with Jenny and her beau, Jim Carrey, along with Charlie Sheen and new wife Brooke Mueller, at the dinner for Generation Rescue, which benefits children with autism.

Witnesses tell Us that Britney looked happy and was "smiling and clapping." She wore a black halter dress with black pumps and her long blonde hair straight and down.

These days, the mom of two has been working on a new album and negotiating child custody details with ex Kevin Federline in court.