Britney Spears proved she still has it after rumors began swirling about a potential retirement. The 39-year-old clapped back at rumors she's pulling the plug on her career by posting an epic dance session from her living room on Thursday, May 21. Putting her impressive summer body on display, the Princess of Pop slipped into teeny tiny booty shorts and a neon sports bra to highlight her new curves. The "Oops!... I Did It Again" singer has been working on her fitness by crushing workouts with her hunky boyfriend while being trapped at home and the results show.