Britney has launched her fourth fragrance for a younger audience, Midnight Fantasy. Now, on the dark blue bottle, Swarowski crystals resemble real stars. Britney Spears sure knows how to make fitness fun.. The year-old got hot and heavy in the gym with her personal trainer boyfriend Sam Asghari, 24, on Thursday - and shared a video of the workout with her fans on social media. Lyrics to "Work Bitch" song by Britney Spears: You wanna You wanna You wanna hot body You wanna Bugatti You wanna Maserati You better work bitch Y.