Britney Spears' final post before entering rehab showed her dancing in a thong bodysuit. Spears, 44, took to Instagram on Sunday, April 12, to show herself dancing to Cardi B, J Balvin and Bad Bunny's "I Like It" while wearing a sheer black thong bodysuit, red hat and knee-high black boots. At certain points in the video, Spears slapped her butt as she showed off her bare back. A rep for Spears later confirmed to Us Weekly that the singer voluntarily checked herself into a treatment facility.