Happy Birthday, Serena Williams!

The champion tennis pro, fashion designer, and owner of one of the best bottoms on the planet, turns 33 on Friday, Sept. 26. She’s won a record number of titles from the US Open to Wimbledon and inspires women to live a fit lifestyle. On top of all that, she has a super-toned derriere. Here are her best squat-inspiring looks of 2014.

Williams took to the beach for some R&R on May 31. She feted the relaxing occasion in a racy animal print one-piece swimsuit, while keeping her blonde locks loose and wild.

Sheer elegance! Williams walked the red carpet for an Oscars afterparty in March 2014, wearing a curve-hugging lace gown by Michael Costello.

In January 2014, she flaunted her derriere in a tiny floral jean jumpsuit as big sis Venus cheered on in the background.

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Williams wore a body-conscious pencil skirt paired with a black crop top to host a tennis match against David Letterman in New York City on Aug. 20.

Score! Serena Williams rocked the Australian Open Previews in January 2014 wearing a red workout top, black tights, and white sneakers.

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