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AUG 29, 8PM
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Britney Spears, Demi Lovato

Kevin Winter/Getty Images; Scott Kirkland/FOX

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Just what does a music idol wear when she's preparing to crush the dreams of hundreds of other would-be music idols?

A cobalt blue Stella McCartney print dress and Gucci shoes, apparently. At least, that was the choice for superstar Britney Spears as she stepped out for the premiere of X Factor in Hollywood this week, sparking an inevitable fashion face-off in the process!

After all, she isn't the only couture-loving pop star on the judges panel.

Though Spears accessorized her outfit with a Kelly Wearstlers ring and Neil Lane earrings, Demi Lovato also brought out the big guns for her look, wearing a sexy black Topshop frock with beaded embellishments, a Swarovski crystal bracelet and Christian Louboutin heels.

The verdict? Well, Lovato's been wearing a lot of black this season, and we would have preferred to see her in a pop of color—say, something like the stop-sign red Topshop frock she wore for X Factor auditions back in July. Then again, black is on trend and you can't fight a trend, now, can you?

And topping off their looks: Spears left (let?) her hair down for the big occasion, while Lovato brought the glam with a sleek updo.

So, it's up to you, Joan Rangers: Tell us, whose X Factor look do you love best?