Unlike Jennifer Lawrence and her rather normal best friend, Laura Simpson, celebs often pick other famous people to have as their BFFs. They all probably bump into each other at so many events that it’s difficult not to end up practically joined at the hip. Some of these celebrity BFFs you’ll already know about, some you’ll be totally surprised to hear have even met!  The phrase chalk and cheese comes to mind.

courteney cox jennifer anistonCourteney Cox, pictured here with BFF Jennifer Aniston and Jen's fiancee Justin Theroux

Courtney Cox and Jennifer Aniston have been BFFs since their Monica and Rachel days. The pair have seen each other through weddings and divorces, children and various film/TV projects. “We just have fun, we laugh, we’re inseparable and it’s great”, Cox said of Aniston, while her best friend in turn dubbed her “the most dependable and loyal”. Mutual appreciation society, or what?  We love it!  That's how all best friends should talk about each other in our opinion.

Rihanna has a rep for being a serious party girl, while Katy Perry is the daughter of Pentecostal pastors and once pursued a career in gospel singing. Their differences don’t stop these two, they’re thick as thieves and always look like they’re having the best of times when together. “I love her. She’s the coolest chick”, Perry told a radio station about her friend.

Leonardo DiCaprio and Tobey Maguire are often snapped together court side at basketball matches, but the pair have been friends since way back in 1990. Both auditioned for a role on Parenthood, a cancelled sitcom, and have been bezzies ever since. The pair recently starred in Baz Luhrmann’s Gatsby together, showing they work well as a team both on and off screen.

Definitely the most unusual of all celeb BFFs...ever, 50 Cent and Bette Midler met in New York while volunteering for an environmental organisation. Midler gushed about Fiddy, “I love him...I was hoping we’d sing songs from the Depression, but he’s so young that I don’t think he knows any of them.” Someone. Anyone. Please make this happen.

Kelly Osbourne and Kim Kardashian have been friends for years now, and Kelly always publicly comes to Kim’s defense when she finds herself badmouthed in the press. Sounds like a full time job to us.

kristen stewart dakota fanningKristen Stewart and Dakota Fanning make unlikely best friends

Dakota Fanning and Kristen Stewart worked together on The Runaways in 2010. Sweet, smiling blonde Dakota seems the antithesis of dark and scowling Kristen, but Fanning admits, “She’s become one of my best friends. We’re really close.” We guess opposites do attract!

Everybody knows that Matt Damon and Ben Affleck are BFFs.  In fact, these guys aren't just BFFs...they're BBFFs.  These two have known each other since they were just eight years old, cementing their love with their Oscar-winning movie Good Will Hunting in 1997.

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Watch Matt Damon spotted with his fans outside 'The Today Show':