Celebrities need BFFs too!

It's not easy being an A-list superstar - the money, the parties, the paparazzi, the pressure to always look your best - so sometimes the only person who understands what George Clooney or Victoria Beckham or Cameron Diaz is going through is another celebrity.

Take a look at some joined-at-the-hip celebrity duos and other famous friendships that went under the radar, until now...