Kaley Cuoco's backside is defying gravity. The 35-year-old "Big Bang Theory" alum slipped out of her actress shoes and into her equestrian ones over the weekend, showing off the results of her horseback riding sessions on her Instagram stories – and this girl ain't a novice. Kaley, followed by 6 million, shared impressive show-jumping videos of herself during a day that was "too much fun," with the sitcom star also outfitted just right for the occasion. Check it all out below.