mtv movie awards red carpet Selena Gomez

We're loving Selena's low-key look!

The gorgeous Disney star just returned from a whirlwind vacation with her main squeeze, Justin Bieber, and she turned up to present at the MTV Movie Awards on Sunday.

But is something up between Gomez and her main man? There was a full-on PDA fest at the Billboard Music Awards last month, but "The Biebes" was nowhere near Selena in the audience tonight. Not only were they NOT sitting together, but the pair weren't seen together either.

What gives?

Are the supposed death threats from rabid "Biebettes" starting to take a toll on Justin's ladylove?