The reality television show The Simple Life premiered on December 2, 2003, and it quickly became a success. The show — which followed wealthy socialites Paris Hilton and Nicole Richie as they are doing manual, low-paying jobs — is considered to be one of the first reality television shows and it opened up doors for future hits like Keeping Up with the Kardashians and The Real Housewives. The show ended in 2007 but its lead ladies Paris and Nicole have remained in the spotlight.

Related: 10 Things Paris Hilton Has Done Since The Simple Life

Today, we're taking a look at all of the celebrity cameos we spotted in episodes of The Simple Life — and it's safe to say that some of these faces are pretty surprising. From Kim Kardashian to Kesha — keep on scrolling to see just who was on the show before their fame!

10 Kim Kardashian Appeared In Four Episodes

Kim Kardashian The Simple Life
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Kicking the list off is reality television star Kim Kardashian. As fans know, prior to her fame Kim was close friends with Paris and in the early 2000s Kim can actually be seen in four episodes of The Simple Life — episodes "Murrie Family", "The Ghauri Family", and "The Nolan Family" which aired in 2006 as well as the episode "Ro-Day-O vs. Ro-Dee-O" from 2003.

9 Kesha Appeared In One Episode

Kesha The Simple Life
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Next on the list is popstar Kesha. The singer rose to fame in 2009 after the release of her debut single "Tik Tok" but prior to that Kesha actually already had some experience in the entertainment industry.

Related: Sofia & Nicole Richie: 10 Little Known Details About The Famous Sisters

In 2005 Kesha could be seen in an episode of The Simple Life titled "Wedding Planner". At the time, of course, neither Paris nor Nicole knew that they were in the presence of a future popstar!

8 Rachel Zoe Appeared In One Episode

Rachel Zoe The Simple Life
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Another famous lady who appeared in an episode of The Simple Life is Rachel Zoe. Prior to starring in the reality television show The Rachel Zoe Project, the fashion designer — who has been Nicole Richie's stylist for some time — actually appeared in an episode of the popular show from the early 2000s. Rachel can be seen in the episode titled "The Padilla Family" which aired in 2006.

7 Kim Richards Appeared In Two Episodes While Kyle Richards Appeared In Three

Kim And Kyle Richards The Simple Life
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Next on the list are Kim and Kyle Richards who were famous actresses all throughout the 70s and 80s but are best known to a younger audience for their participation in the Bravo reality television show The Real Housewives of Beverly Hills. Kim and Kyle are also Paris Hilton's aunts which is why it's not surprising that the two also appeared on The Simple Life. Kim can be seen in two episodes — "Almost Fame-Less" from 2007 and "Back in the Saddle" from 2004 — while Kyle can be seen in three episodes — "The Padilla Family" from 2006, "Back in the Saddle" from 2004, and "Ro-Day-O vs. Ro-Dee-O" from 2003.

6 Kathy Hilton Appeared In Six Episodes

Kathy Hilton The Simple Life
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Kim and Kyle's sister Kathy Hilton a.k.a. Paris Hilton's mother also made a few appearances on the reality television show. Considering that Kathy is Paris' mom, it certainly doesn't come as a surprise that she can be seen in six episodes of The Simple Life — "Flirting with Disaster" and "Welcome to Camp Shawnee" from 2007, "The Weekes Family" from 2006, "Back in the Saddle" and The Lost Episode from 2004, and "Ro-Day-O vs. Ro-Dee-O" from 2003.

5 Ryan Seacrest Appeared In One Episode

Ryan Seacrest The Simple Life
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Next on the list is television personality and producer Ryan Seacrest. Ryan — who is perhaps best known for being the creator and executive producer of Keeping Up with the Kardashians — also made an appearance on Paris and Nicole's popular show. Ryan Seacrest can be seen in the 2006 episode of The Simple Life titled "Bowden Family".

4 Lionel Richie Appeared In Two Episodes

Lionel Richie The Simple Life
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Let's move on to musician Lionel Richie who is Nicole Richie's adoptive father. Just like Kathy Hilton, it's certainly not too surprising that Lionel made an appearance on his daughter's show.

Related: Everything We Know About Paris Hilton And Nicole Richie's Relationship (And Feud)

The famous musician could be seen in the episode "Beggs Family" from 2006 as well as the episode "The Padilla Family" from 2006.

3 Robin Antin

Robin Antin The Simple Life
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Another famous face that some may have spotted on The Simple Life is Robin Antin. The dancer and choreographer is best known for founding The Pussy Cat Dolls, and in 2006 she could be seen in an episode titled "Burton Family". Robin and Paris have been friends for a long time in the 2000s the two would frequently be spotted together.

2 Diane Warren

Diane Warren The Simple Life
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Musician Diane Warren has also made it onto today's list as the star also appeared in the same episode as Robin Antin. Diane, who rose to fame in the early 80s is definitely one of the most well-known celebrity cameos on the popular reality television show from the 2000s.

1 Three 6 Mafia

Three 6 Mafia The Simple Life
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Wrapping the list up is the hip-hop group Three 6 Mafia who also appeared in the same episode of The Simple Life as Robin Antin and Diane Warren. The hip-hop group — which appeared in the episode titled "Burton Family" — has been spotted hanging out with Paris Hilton quite a lot in the 2000s which is why it's nos surprise that they had a came on her show.

Next: Who’s Been More Successful After ‘The Simple Life’: Nicole Richie Or Paris Hilton?