Kylie, 21, threw on a short blonde wig for a fun night out with Kendall, 23.
Sofia Richie also joined in on the birthday shenanigans.
Kylie dazzled in a sparkly dress while Kendall sizzled in a animal print ensemble.
They celebrated the birthday of Tiffany Sorya, founder of Novel Education Group, which specializes in providing homeschool services to families with unconventional lifestyles. She's tutored the children of several celebrities including Dr. Dre.
The mother-of-one playfully smacked Tiffany's behind while the birthday girl danced her heart out.
Do you like Kylie as a blonde? Sound off in the comments!