Caitlyn Jenner Shows Off Major Cleavage at Kim Kardashian's Surprise Birthday Party

Caitlyn Jenner rocks a form-fitting dress while leaving Westlake Cinepolis Theater on Wednesday (October 21) in Thousand Oaks, Calif.

The 65-year-old former Olympian attended daughter Kim Kardashian‘s surprise birthday party thrown by her husband Kanye West, who rented out the entire theater for family and friends to watch Steve Jobs.

PHOTOS: Check out the latest pics of Caitlyn Jenner

Caitlyn took to Instagram to wish Kim a happy birthday with a cute throwback photo, which you can see below!

“Happy birthday beautiful @KimKardashian!” she captioned it.