Serena Williams Serving Up Sexy Shots for Her 44th Bday!

On and off the court, Serena Williams is a vet, and in honor of her 44th bday, we're runnin' through her hot shots ... they'll make you sweat!

Slip into silky-smooth snaps of Serena slaying lingerie and robes, and chase after her bikini pics that attract thousands of clicks ...

Yellow there!!! Serena slays her hot shots on the beach, serving up some fun in the sun and rockin' swimwear like this selfie!

When the tennis icon has a quick timeout from her motherly duties, she's up in the gym workin' on her fitness game ... She doesn't just play, she dominates!