Kim, 38, and Kourtney, 40, headed out of Craig's in West Hollywood.
The mother-of-four wore a lime green ensemble for the birthday festivities while Kourtney showed some skin in a gorgeous purple number.
Larsa, who turns 44 on July 6, dazzled in a sparkly dress that left little to the imagination.
Khloe Kardashian, along with Kylie, Kendall and Brody Jenner, were also in attendance.
Khloe, 35, wore a little black dress while Kylie, 21, took a big fashion risk in her bright orange getup.
Kendall, 23, sported a pair of shiny shades after leaving Craig's.
Which KarJenner sister gets your pick for Best Dressed at Larsa's birthday celebration? Sound off in the comments!