Ahhhh, The Hills... one of the first reality TV shows of it's kind, with us all glued to our TV screens to find out what the likes of Lauren Conrad, Audrina Patridge, Whitney Port and Heidi Montag were up to in the beautiful city of Los Angeles.
With the recent news that the super-popular show is getting a reboot, featuring some of the original cast, we've re-watched episode upon episode of all six seasons, leading us to remember some celebrity cameos we TOTALLY forgot about!
RADIO The Hills celebrity cameos stacked
1 of 8Lady Gaga
Not many people remember this, but before Lady Gaga made her millions, the singer appeared in Season 4 of The Hills. Whitney Port and Lauren Conrad were given the task of dressing the 'Just Dance' singer, and when her zip got stuck, LC saved the day!
2 of 8Kim Kardashian
Unfortunately for Kim, her scenes were actually cut on the main show of The Hills, but MTV did finally show them during the 2016 special The Hills: That was then, this is now.
3 of 8Sean Kingston
'Beautiful Girls' singer Sean Kingston appeared on the show in Season 3. Audrina Patridge accompanied the singer to his Jimmy Kimmel Live! rehearsal, and in turn she was sent flowers by him.
4 of 8Lily Collins
Actress Lily Collins was also on the show in Season 3, making her debut as one of models at the famous Crillion Ball in Paris.
5 of 8Marc Jacobs
In Season 3, Lauren Conrad was flown to New York City by Teen Vogue to assist fashion designer Marc Jacobs and his design team.
6 of 8Justin Timberlake
The one and only Mr Justin Timberlake appeared at a party in Season 3 of the show, where both Whitney Port and Lauren Conrad were working.
7 of 8Brandy
American singer Brandy appeared on the show in Season 4, when she was filmed in the recording studio with Audrina Patridge, who worked for Epic Records at the time.
8 of 8Emily Weiss
She's now known as the founder of cosmetic company Glossier, but Emily Weiss appeared on The Hills as an intern at Teen Vogue.
Meanwhile, in news which made us scream with happiness, it was announced back in 2018 that the show will be returning to our screens for a reboot called The Hills: New Beginnings.
Despite LC not taking part in the reboot, many of the original cast are making a comeback, including Whitney Port, Audrina Patridge, Heidi and Spencer Pratt, Brody Jenner, Stephanie Pratt and new member Mischa Barton.
Filming for the new show has already started, with many of the cast sharing snaps on social media. However, no official date for The Hills: New Beginnings has been confirmed.