Danny Masterson and his brother Chris lived it up at Sundance!

OK! GALLERY: JENNIE GARTH, ASHLEY BENSON AND OTHER CELEBS SOAK UP THE SUN AT AZURE POOL PARTY IN LAS VEGAS

The two chatted at genart's second annual "Sweaty Hot Dance Party" in Park City, UT and had a blast at the event.

Chris DJ'd for the evening to a packed house and when he wasn't spinning tunes, he was celebrating his birthday with family and friends!

Have birthday wishes for Chris? Tweet them to @OKMagazine!