Whoop! She did it again! Britney Spears debuted a shockingly hot new hair color last night while attending Elton John's Aids Foundation Oscar Viewing Party in Los Angeles.

The 31-year-old singer and former X Factor judge debuted her stunning new warm brunette locks while wearing an ultra low-cut black beaded dress by Michael Cinco Couture.

Spears was last seen earlier this week getting groceries at a local supermarket sporting light blonde hair, tied up in a bun. The last time Britney Spears had brunette hair was briefly at the beginning of 2010.