Justin Bieber supports Chris Brown with graffiti: Dumbest celeb friendship?

Bieber and Breezy: Best friends forever! Justin Bieber and Chris Brown aren't exactly two peas in a pod, but the 19-year-old pop star publicly displayed his support for Brown this week when he spray painted "Free Breezy" on a wall in Colombia.

SODAHEAD SLIDESHOW: Dumbest celebrity friendships

If you don't get the reference, Chris Brown voluntarily checked himself into rehab for anger management issues this week after getting into yet another physical fight with someone. But, apparently, the Biebs doesn't think Breezy deserves to be in rehab.

Justin Bieber and Chris Brown certainly make up a weird -- and let's admit it -- pretty dumb celebrity alliance. But is it the stupidest celebrity friendship out there?

Let's not forget that former NBA basketball player Dennis Rodman is best friends with a North Korean dictator. Or that Paris Hilton and Kim Kardashian used to be socialite BFFs... while also being famous for absolutely nothing. And how about that Mel Gibson and Britney Spears bond, huh?

From Bieber and Breezy to Paris and Kim, what's the dumbest celebrity friendship of all time?