Britney Spears is so happy, she’s doing cartwheels — literally. On Wednesday, the 39-year-old singer took to Instagram to post a video of herself horseback riding and doing cartwheels in the…

During Britney Spears’ shocking testimony last week in an L.A. court, one of her most jaw-dropping claims was that due to her conservatorship, she has been prevented from marrying her boyfriend, and…