Long before Britney & Christina walked the red carpet, they first met as members of Disney's Mickey Mouse Club.
Though their competitive rivalry certainly put a strain on their relationship, both have shown open support for one another over the years.
Jada Pinkett-Smith has been very open about her friendship with Tupac Shakur.
In a recent interview with The Daily Mail, Jada was overcome with emotion as she recalled their high school years together.
Two more alumni from The Mickey Mouse Club; Ryan Gosling and Justin Timberlake have known one another for years.
While they are admittedly not the closest of friends, their paths crossed and intersected numerous times as young men.
The lifelong friendship between Ben Affleck and Matt Damon has been well documented.
The pair met all the way back in grade school and have maintained a tight-knit friendship ever since.
Adele and Jessie J have been friends since their days at the BRIT school.
According to Jessie J, the pair were known to belt out tunes together during lunchtime.
Guess who used to be roommates? Judd Apatow and Adam Sandler - that's who!
These respective comedic giants once shared a $900 a month apartment in the San Fernando Valley.
Being the new kid is hard, especially when you also happen to be the only visible minority in the school.
Luckily for Maya Rudolph, she quickly became friends with classmate Gwyneth Paltrow. The actresses remain besties still to this day.
Paris Hilton and Kim Kardashian collectively invented the concept of "famous for the sake of being famous."
But long before they walked their first red carpet, the girls were close friends from a very young age.
Amy Poehler and Tina Fey meeting one another at the Improv Olympics sounds like the build-up to a bad joke.
The comedians hit it off right away and remain incredibly close.
According to an interview with US Weekly, Kristen Bell states that she and Mathew Morrison were college sweethearts.
The pair dated briefly and remain friendly toward one another.
Without question, this has to be the greatest 'meet-cute' of all time. Remember the children's TV show Barney? Well, it turns out that both Selena Gomez and Demi Lovato appeared on the show together!
The singers forged a fast friendship that's still going strong.
Famous people have famous friends; it's as simple as that. That's how Liv Tyler and Kate Hudson became acquainted - through Liv's rockstar father and Kate's movie-star stepdad.
These lifelong friends are practically inseparable.
Mel Gibson and Geoffrey Rush are two of the most revered actors in Hollywood today.
The pair first met in their shared homeland of Australia during a theater production.
Leonardo DiCaprio and Tobey Maguire have been friends for over 30 years. They met at an audition when they were still young boys and the rest is history.
They've performed on-screen together and have even been known to attend the occasional Lakers game with one another.
Not only did Cameron Diaz and Snoop Dogg attend the same high school, but the actress even claims to have bought weed from The Father of Rap.
