It was obvious that Taylor Swift was grossed out by watching her good friend Selena Gomez go in for a smooch with Justin Bieber at last night's Billboard Music Awards! 

The video comes from a backstage camera and shows Swift passing through with Gomez, when Bieber spots them and pulls Gomez in. The two share an awkward cheek smooch.

Swift sticks her tongue out in a "I'm grossed out by that" way!

It seems obvious that Swift isn't a huge Bieber fan and that's she's looking after her BFF Selena.  And it all makes for a funny video!