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'Best friend' means forever, right? Well, maybe not. These high-profile celebrities used to be best friends, but let's just say they're definitely not anymore. 

From smack talking to stolen boyfriends, secret sexy texts to not-so-subtle songs (we're looking at you Taylor Swift), drama surrounds all of these friendship fails. It's kind of like real life, right? No matter the cause, these celebrity friendships are an entertaining walk down memory lane.

Check out all these celebs who used to be besties but aren't anymore!