Kim Kardashian showed off her booty in spandex pants on June 28. Credit: Alo Ceballos/GC Images

Even when she's covered up, Kim Kardashian manages to show off her famous curves! The reality star, 33, hit the gym on Saturday, June 28, in a curve-hugging black spandex outfit. 

PHOTOS: Kim's best booty moments

Most noticeable was her bootylicious backside, which was on display as she headed to Barry's Bootcamp in New York City. Kardashian appeared fresh-faced with virtually no makeup, and swept her hair up in a ponytail.

The night before, Kim stepped out for the yacht party in honor of sister Khloe's 30th birthday. Wearing a stunning royal blue Ulyana Sergeenko corset gown with a thigh-high slit, Kanye West's new wife managed to, once again, steal the show. 

"KoKo!!! My baby sister!!! Happy 30th Birthday!" Kim captioned a picture of her childhood sister on her birthday. "I love you so much! I love seeing you so happy! You are the strongest person I know(literally & figuratively) !!!! LOL."