The pair -- along with momager Kris Jenner -- attended the event to support Kendall, who hit the runway in a very revealing black window pane-printed dress with nude paneling. See another risque look from the show in the gallery above!
While the model should have been the center of attention, her older sister stole the spotlight from her ... yet again.
The 18-year-old beauty recently revealed that she prefers if Kim steers clear of her runway shows -- and now we can see why!
"Kim was invited to a lot of the shows that I was in," she previously told LOVE magazine. "She called me before and was like, 'Hey, I was invited to the show, I just wanted to let you know. Do you want me to come?' and I was like, 'No.'"
In addition to banning her famous sibling from her gigs, Jenner also has officially dropped her last name to move away from the notoriety of the Kardashian-Jenner clan.
Kendall recently said that her famous last name was not a benefit to her modeling career. "People didn't want to take a chance on me, I think because I was sort of known," she told Teen Vogue. "They were a little bit on the fence about it. Some people might think that what I've done before made it easier for me to get jobs, but it was actually a disadvantage. I had to work even harder."
Well, she definitely has a point!
Kim stole the spotlight again later in the day on Thursday, as she made her way to the Lanvin show in one of the most revealing dresses she's ever worn. Though it looks like she decided to go topless to the event, there actually is some fabric under that blazer -- and probably a whole lot of double-sided tape!
Check out a closeup of the risque look in the gallery below.
Do you think Kim should stay away from Kendall's shows? Sound off below. And, just because the photos are adorable, see North West make her Fashion Week debut below!