Don't be jealous -- most of us don't look anywhere NEAR this good at 38 but Paris Hilton celebrated her 38th birthday with pals Kim and Kourtney Kardashian, Larsa Pippen, and lots more friends Saturday night and these ladies -- Paris and Kim, who are the same age -- are just KILLING with their ageless looks.

Paris wore a super-sexy sequined bodysuit with a LOW zippered front and while she often seems demure, she wowed the crowd with her wild side this weekend, even taking to the pole to show off her moves!

Ms. Hilton turned her Beverly Hills mansion into a club -- gettin' down with the likes of Frankie Delgado, who posted lots of pix and videos of the event. Paris captioned one of her pix from the evening, "Love you @KimKardashian 💋 So much fun celebrating my birthday with you at #ClubParis."

Paris' actual birthday was last month, but with everyone's busy schedule, this was the first opportunity for the ladies to get together and celebrate. And what better weekend than St. Patrick's Day weekend, which gave Paris a built-in theme for the event. Erin Go Braugh!