Jamie Lynn Spearscan dance! The 29-year-old took to Instagram on October 2 to share a new video of herself dancing — much like her big sister Britney Spears. In the carousel post, Jamie rocked a one-shouldered black crop top, high waisted black pants, white sneakers, and a black protective face mask. She included a series of mirror selfies in the post, which showed the blonde beauty posing and flaunting her taut abs.