Britney Spears got in on the Cinco de Mayo fun with her family in LA Saturday. She and Jason Trawick met up with Britney's brother Bryan, sister Jamie Lynn and her daughter Maddie, as well as dad Jamie. Britney's just one of the many stars that love Cinco de Mayo and she showed off her excitement for the holiday in a cropped red shirt that displayed her stomach. Britney's abs were also on display in a recent shoot for the Twister Dance game. It's just the latest business project for Britney, who is also rumored to be joining The X Factor, though no official announcement has been made about the show's new crop of judges.