How do we know this? Here we can see some private pictures of her petite body, and we can see some screenshots taken from her showing off her body in one of the many movies she was part of.
Orlando Bloom was also present because why the fuck not? This is very common in her line of work anyways, Being a model.
Although Kate's main line of work was acting, she did stick her toes in the music industry as well.
She also is half of the Comedy Duo Garfunkel and Oates.