Demi Lovato Fashion Face-Off

One judges singers on The X Factor.

The other casts spells on The Vampire Diaries.

But both Demi Lovato and Kat Graham came out last night for the VH1 Divas concert special. And while we aren't sure how they feel about Miley Cyrus covering Billy Idol, we do know that they wore contrasting outfits on the red carpet.

Which do you prefer? Graham's white get-up? Or Lovato's black dress? VOTE NOW!

Starting tonight, Demi Lovato and Britney Spears will judge contestants on The X Factor Season 2.

But before we watch these young superstars hand out compliments and critiques, let's do a bit of both ourselves, shall we?

The singers walked the red carpet of an X Factor premiere party in Hollywood last night, with Demi donning a short black skirt and Britney feeling a lot more blue. Which pop star pulled off her outfit best? That's for us to ask - and you to decide!

Compare. Contrast. Vote now.

It is on between Demi Lovato and Emma Watson.

Both young beauties made an appearance at the 2012 Video Music Awards, with Lovato taking home the trophy for Best Video With a Message and with Watson simply being awesome as always.

In our latest VMA-based Fashion Face-Off (we've also pitted Drake against Chris Brown and Katy Perry against Rihanna), we take Demi and her short black dress and we ask viewers to decide if that's preferable to Watson's multi-colored skirt.

Which do you like best?

Vanessa Hudgens introduced Demi Lovato at the People's Choice Awards last night, prior to the singing coming out and underwhelming us with a performance of "Give Your Heart a Break."

So it's only appropriate that these two are linked here, in the latest edition of a THG Fashion Face-Off.

Both stars chose a dress for the event that highlighted a certain section of their bodies; for Demi it was the chest region; for Vanessa, the back. Do you prefer one style over another? Did Lovato go too far with her cleavage accentuation? Which look do you like best? Decide now.

It's time to get serious, Selena Gomez and Demi Lovato.

Yes, you were two of the biggest winners at the 2011 Teen Choice Awards, with the former taking home five trophies and the latter earning two, including the Inspire Award. And you played around together backstage, hugging and laughing for photographers.

But this is no laughing matter. There is no place for humor in the THG Fashion Face-Off world. Put on your game faces, prepare to defend your fashion choices and hope readers select your outfit as the prettiest. Friends are about to become foes, folks...