Britney Spears proved she has put her recent court battles behind her by stepping out for a charity event hosted by comedian Jim Carrey and his girlfriend Jenny McCarthy.

The Toxic hitmaker saw permanent custody of her two children handed over to ex-husband Kevin Federline on Thursday, following 18-months of court hearings, mental trauma, and a breakdown.

But she stunned onlookers on Saturday by arriving at the Los Angeles party in an elegant black evening dress, with perfect hair and make-up for her glamorous night out.

And the singer appeared to be in good spirits.

A source tells People.com, "She looked great and seemed really happy. She smiled and clapped during the video about autism."

Other stars to attend the charity fundraiser, in aid of Carrey and McCarthy's Generation Rescue, a foundation for autistic children, included Rose McGowan and newlyweds Charlie Sheen and Brooke Mueller.