Kendall Jenner wore a sexy jumpsuit to her 20th birthday bash on Monday night that was backless and the next-best-thing to topless, too. The black Sergio Hudson jumpsuit featured wide legs and fishnet insets, as well as a wide patent leather belt cinched at Kendall’s tiny waistline. The plunging V-neck reached her waist–leaving little from the waist up to the imagination.

Tuesday is actually Kendall Jenner’s 20th birthday, but a group assembled at The Nice Guy in L.A. for a private party the night before.

Skintight looks, sequins, and sheer: See what the Kardashian-Jenners wore to Kendall's b-day party! https://t.co/Y6sIGswceG

— Us Weekly (@usweekly) November 3, 2015

Sisters Kourtney Kardashian, Kim Kardashian West, Khloe Kardashian, and Kylie Jenner were on hand for the celebration, as was Kendall’s mom, Kris Jenner. The Keeping Up With the Kardashians gang weren’t the only celebrities on the guest list, however. Justin Bieber, Nick Jonas, Kanye West, Tyga, Gigi Hadid, and both Jaden and Willow Smith attended Kendall Jenner’s birthday bash.

Anyone who knows anything about the Keeping Up With the Kardashians family knows the ladies love having their pictures taken. In keeping with that theme, Kendall’s party featured a photo booth. Some fun shots emerged from that photo booth Monday night, and found their way to Kylie Jenner’s Instagram account.

“Happy birthday Kendall pot pie,” Kylie captioned this shot that features Kendall Jenner in the back row.

A photo posted by King Kylie (@kyliejenner) on Nov 2, 2015 at 11:00pm PST

Do you suppose there will be another birthday celebration for Kendall Jenner on her actual birthday, November 3rd? She can’t possibly dress any sexier than she did on Tuesday night in that jumpsuit.

Maybe the Jenner-Kardashian family will do something more low-key for Kendall. Do you think Caitlyn Jenner and Kris Jenner will attend a gathering for Kendall together?

Happy 20th birthday, Kendall Jenner.