The two teen sensations used to be best friends and the inevitable happened—Lovato unfollowed Gomez on Twitter! OMG! While Lovato vowed to "plead the sixth" (technically the "fifth," if you were listening in junior high) and says, ""I think its just one of those things where people change and people grow apart." But insiders say that since Lovato has expressed her disdain for Gomez's then-boyfriend Justin Bieber publicly, their friendship was inevitably doomed, since 20-year old-girls always choose terrible boyfriends over good friends. Beliebe me!