Britney's brother Bryan got a special treat at his 27th birthday bash in April: His famous sister arranged for actress Carmen Electra and her Pussycat Dolls burlesque group to put on a sexy 20-minute show for him. Clad in a Pussycat Dolls' costume, Britney herself sang "Happy Birthday" a cappella. But first the pop princess hired actors to pose as FBI agents, arrest Bryan, handcuff him and take him to L.A. club Space, where 50 friends shouted, "Surprise!"