Kanye West first appeared on the reality show back in 2012 when he stopped by the opening of Scott Disick's restaurant and hung with Kim. This was around the time the now-married couple started dating, and it marked the first of many more appearances to come.
Demi Lovato was included in the 2011 star-studded episode 'Kim's Fairtytale Wedding: A Kardashian Event Part 2.'
Tyga & Kylie Jenner
Back in December of 2011, Tyga made his first appearance on the show as none other than the musical guest for Kendall's Sweet 16. And guess who booked him? Kylie, of course. The two later started dating and are still together.
Former Cheetah Girl Adrienne Bailon first appeared on the show in a 2008 episode, about a year after she and Rob had started dating. She was only in a handful of episodes, including the one in which Khloe and Lamar got married and Rob tried to rekindle his relationship with her.
Back in 2008, Aubrey O'Day and Kim Kardashian both attended the launch party for Kritik Clothing held at Lisa Klein. The clothing line was designed by Kim's best friend, Jonathan Cheban.
Avril Lavigne also appeared on the show for Kim's two-part wedding extravaganza. The singer had started dated Brody Jenner, Kim's stepbrother, prior to the wedding. The couple dated for nearly two years but broke up soon after Kim said "I do."
Ciara was yet another one of Kim's famous wedding guests. Ciara and Kim have been longtime friends.
Kris Jenner invited her "good friend" Lance Bass over to their home for dinner one evening, and it was all filmed for a 2012 episode of the show. In the clip shown, the dinner conversation centers on Lou Pearlman.
French Montana had his debut on the show once he and Khloe started dating. Their relationship lasted about a year, but French also popped up in a recent episode when he dropped by Disick's new home.
Fabolous, among many more celebrities, attended Kanye's Yeezy Season 2 fashion show. He was briefly shown in a clip backstage.
Kelly Osbourne appeared on the opening episode of season 3. The episode saw Khloe serving jail time for receiving a DUI.
Though Robin Thicke appeared in the season 6 premiere, he also performed as Kim and Kris Humphries' wedding singer later in the season. He sang "Angels" for the couple's first dance.
The-Dream also appeared on the first episode of season 6. Previously, he worked with Kim on her single "Jam (Turn It Up)," which he produced.