Hey! Britney Spears hit a star-studded event Saturday night, hanging with Jenny McCarthy and Jim Carrey at their fundraiser for Generation Rescue, an organization dedicated to researching autism.

"She looked great and seemed really happy," a guest told People.com, of the pop star.

She didn't socialize much with the other partygoers, but "she smiled and clapped during the video about autism. She was very into the information and watched a little bit of the dancers from Dancing with the Stars, sneaking out during one of the performances."

Nice, Brit. Get back out there -- have a little fun all while being a responsible adult. It can be done, you know.

Not that I would know, I just spent all day yesterday getting over a massive hangover from partying too hard in Atlantic City. I really should learn to take my own advice.