Britney Spears
may have finally decided to officially join "The X Factor" -- but she couldn't decide what to wear for the big announcement!

The new judge made two appearances for the show yesterday in NYC for the FOX Upfronts, where she wore two different outfits.

While co-stars Demi Lovato, Simon Cowell and L.A. Reid opted to wear the same clothes for the Upfront and the Post-Party, Britney changed from a short cream dress to a Alexande Wang purple mini -- a dress that almost gave Brit another wardrobe malfunction.

Luckily, fiance Jason Trawick was there to block photos from getting too much!

How do you think Britney will do as a judge? Sound off below!

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