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Landon Clements (Season 1, Episode 3)
Years before she joined the cast of Bravo's Southern Charm, Landon was known as "Brent's other assistant" at Bolthouse PR. Heidi Montag quit attending FIDM with Lauren Conrad to work at the firm.
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Tom Sandoval (Season 1, Episode 8)
During a Teen Vogue casting, the model and future Vanderpump Rules star stripped for the camera.
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Colton Haynes (Season 2, Episode 8; Season 3, Episode 11)
In Season 2, Whitney Port was tasked with fetching the future Arrow star's converse while assisting on a Teen Vogue photo shoot with her little sister, Jade Port. In Season 3, Whitney photographed Colton at Smashbox Studios when Teen Vogue was casting its Young Hollywood issue.
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Derek Theler (Season 2, Episode 9)
Lauren Conrad rang in the New Year with a kiss from the future Baby Daddy actor.
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The Red Jumpsuit Apparatus (Season 3, Episode 8)
Teen Vogue interns Lauren Conrad and Whitney Port had the band try on jeans at the Magic Castle Hotel. Later that night, they went for drinks at The Dime. To Whitney's surprise, the rockers were on time for their Teen Vogue shoot the next morning—but one of the band members refused to wear the jeans she'd selected, putting her job on the line.
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Marc Jacobs (Season 3, Episode 12)
Teen Vogue flew Lauren Conrad to New York City to assist Jacobs' design team. After styling outfits for the label's look book, Lauren spent the afternoon alphabetizing documents—and that's when the label's namesake designer popped by to say hello.
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Sean Kingston (Season 3, Episode 14)
After Audrina Patridge was promoted from her receptionist job—and as her relationship with Justin "Bobby" Brescia was on the outs—she accompanied Kingston to his Jimmy Kimmel Live! rehearsal. The singer sent her flowers as a thank you. "He sent those?" Audrina asked her Epic Records co-worker Chiara Kramer. "He's only 17 and he's sending flowers already! It says, 'It was great working with you. Thanks for all your hard work.'"
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Lily Collins (Season 3, Episode 19)
After becoming known as "the girl who didn't go to Paris" in Season 1, Lauren Conrad traveled to the City of Light with Whitney Port to work on a Teen Vogue feature at the Crillion Ball. One of the debutantes was none other than the future Mortal Instruments: City of Bones actress.
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Lady Gaga (Season 4, Episode 5)
While interning for People's Revolution, Whitney Port and Lauren Conrad were sent to assist the "Just Dance" singer at a musical showcase. When the pop star's zipper got stuck, it was Lauren who saved the day. "You're a superwoman right now!" Gaga exclaimed.
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Taylor Armstrong (Season 4, Episode 7)
Brody Jenner's mom, Linda Thompson, and the future Real Housewives of Beverly Hills star bumped into Stephanie Pratt and Doug Reinhardt on a "non-date" at Beso.
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Brandy (Season 4, Episode 12)
Epic Records sent Audrina Patridge and Chiara Kramer to Darkchild Studios, where Brandy was working on the song "Long Distance" with Rodney Jerkins.
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Scheana Shay (Season 5, Episodes 4 and 7)
A friend of "Stacie the Bartender," the future Vanderpump Rules star was more of a background player. When Stacie, Scheana and another friend showed up at H.Wood—where Stephanie Pratt, Heidi Montag and Holly Montag were partying—drama ensued. "No, she did not just wave at you," Stephanie said of Stacie, who had been a little too flirty with Spencer Pratt. "What is her problem?"
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Ryan Cabrera (Season 6, Episodes 3-9)
Audrina Patridge dated the singer-songwriter for several months. When they ran into her ex, Justin "Bobby" Brescia, at Les Deux, Ryan knew it was over. "I don't really want to be a part of this stupid s--t," he told her. "Are we going anytime soon?" The couple broke up in the next episode.
Kim Kardashian, The Hills: That Was Then, This Is Now
The Keeping Up With the Kardashian star's scenes were cut—but MTV finally aired one of them in a 2016 special. While attending at party at Heidi Montag and Spencer Pratt's new apartment, Kim admired their fish tank. "We're the only people in America to have jellyfish," Heidi boasted.