Christina Aguilera -- All American Ass! -

The day before the elections, singer turned television show judge Christina Aguilera showed off her bootyful patriotic backside in a pair of sexy skintight blue pants with white stars all over them in L.A. last night.

Aguilera was at Mozza, where she had dinner with fellow "Voice" judge Blake Shelton and his wife Miranda Lambert (video below).

Fun fact: Aguilera is super familiar with Mozza. It's where she was boozing heavily on the night she was arrested for public intoxication along with her bf Matt Rutler last year. Yeah, that happened.