The Grammy Awards is the biggest night in music and one of the best award shows around. Besides the fact that stars like to go all-out with their red carpet looks –- we're looking at you, Nicki Minaj –- the performances are seriously epic! And they kind of have to be, since there's a new one after every other award.

The show has a tradition of teaming up different artists to put on one hell of a collaborative performance. This year, we’ll see Song of the Year nominee Ed Sheeran take the stage with the one and only Elton John -- a.k.a. the ultimate ginger singing duo!

Plenty of other greats have performed with the musicians of today. Take a look at the most memorable collaborations that have hit the Grammy stage!

Some people say that Hollywood is just like high school, but this is one school where cliques went out the window long ago!

Friendships in Hollywood seem to form regardless of age, background, interests and general levels of sanity. Famous faces that you couldn't imagine having anything in common are frequently seen out and about, posting their outings together on Twitter and Instagram for the world to see. Check out our rundown of the 10 most unusual celebrity friendships!

Which unusual celebrity friendship (naturally) played out on an episode of reality television? Find out after the jump!