Kate Upton revealed she even has cheat-days when it comes to her diet!

The Other Woman actress’ new movie may come out this Friday, but her sexy bikini scene on the beach is already getting attention, and she exclusively told E! News that her body could have been better.

"Of course, I always try to live a healthy lifestyle, but that was my birthday week," she said at the premier of her new movie. "So that was the least healthy I've ever been. I just turned 21."

The Sports Illustrated model celebrated with her costars, Cameron Diaz and Leslie Mann. Sounds like a great way to spend your birthday week!

Image via Kate Upton/Instagram

Upton also revealed she was nervous when she first arrived on set.

"I'm the kind of person who really likes to know what's coming next, but Leslie and Cameron were just warm right away and supported me every step of the way and made me so comfortable. I felt like I was in a safe place,” she added.

The three women recently attended the premier of their new movie at the Regency Village Theater in Westwood, California, according to the Hollywood Life.

Diaz was sporting a little black dress, while Upton donned a short grey and cream dress. Mann looked stunning in a crop top hot pink top and floor-length coral skirt.