Simon Cowell, Britney Spears, Demi Lovato at 'X Factor' USA final party

X Factor USA judges Simon Cowell and Britney Spears attended the Fox show's viewing party at Mixology in Los Angeles last night (December 6).



Spears, 31, wore a floral form-fitting leather dress with sheer panelling at the sides, while Cowell, whose face was looking slightly swollen, kept it casual in a black jumper and jeans.



The pair were joined by fellow judges Demi Lovato, in a floral dress and biker jacket, and LA Reid, in a grey suit and pink shirt.



Co-hosts Mario Lopez, with wife Courtney Mazza, and Khloe Kardashian, looking chic in a green skirt and silk blouse, also graced the red carpet.





The four final acts attending the party included Tate Stevens, Fifth Harmony, Carly Rose Sonenclar and Emblem 3.





Take a look at last weekend's X Factor USA show here:

Copyright: Fox Ray Mickshaw