When you're a kid, a shared love of Ninja Turtles is all it takes to forge a lifelong friendship.
Sometimes it seems like it's the same way with celebrities. Stars who have nothing in common other than wealth and fame often form bonds that baffle us plebeians.
Sure, money and power tend to break down a lot of social barriers (Mick Jagger has been knighted by the Queen of England. 'Nuff said.), but even that explanation can't help us wrap our heads around some of the stranger sets of celeb-besties:
Some of these pairings aren't so shocking when you consider their backstories (Jonah Hill has a history of stalking his A-list co-stars, so it's no surprise he latched on to Brad Pitt).
Others, we're not sure we totally believe. (Gwyneth Paltrow and Jay Z? Right, keep trying to sell us on that one, Gwinnie.)