Adam Levine & Jonah Hill
Adam Levine and Jonah Hill are basically brothers. They grew up together in Los Angeles after their dads met in the principal's office in junior high. Hill even officiated Levine's wedding to Behati Prinsloo.
Demi Lovato & Selena Gomez
Demi Lovato and Selena Gomez met on the set of "Barney" when they were kids. They later moved on becoming Disney stars in their own respective shows, "Wizards of Waverly Place" and "Sonny with a Chance". The girls also starred together in Disney's "Princess Protection Program".
Justin Timberlake & Ryan Gosling
Justin Timberlake and Ryan Gosling met as kids on the revival of the "Mickey Mouse Club". They even stayed under the same roof while filming the show. When Gosling's mother had to return to Canada for work, Timberlake's mom became Gosling's legal guardian for six months.
Lindsay Lohan & Raven-Symoné
Lindsay Lohan and Raven-Symoné, who both started acting as kids, met at a photo shoot and instantly became friends. They even made plans to move in together. Lindsay paid rent for 14 months but she never really moved in due to being busy with work.
Nicole Kidman & Naomi Watts
Nicole Kidman and Naomi Watts have been pretty much inseparable since they first met at North Sydney High School in Australia. They have now been friends for over 35 years.
Kate Hudson & Liv Tyler
Kate Hudson and Liv Tyler have been BFFs for awhile. Both actresses attended the Crossroads School for Arts and Sciences in Santa Monica, Calif.
Adam Sandler & Judd Apatow
Before their fame, Adam Sandler and Judd Apatow were roommates. They lived in a $900/month Valley apartment.
John Krasinski & B.J. Novak
John Krasinski and B.J. Novak have known each other since high school. They played Little League together and Krasinski even acted in a play Novak had written. Both later starred on the hit comedy show "The Office".
Ben Affleck & Matt Damon
Ben Affleck and Matt Damon have been lifelong friends. They met when they were kids. Together, they wrote and starred in the Academy Award-winning film "Good Will Hunting" and their careers escalated from there.
Tina Fey & Amy Poehler
Tina Fey and Amy Poehler have been great friends for a very longtime. They met in their 20s as improv comedians.
They created a two-woman show called "Woman of Color" at the ImprovOlympics. Both eventually ended up at "Saturday Night Live".