Christina Aguilera is tired of people (like Kelly Osbourne) calling her “fat” … so she responded by stuffing herself in a super tight outfit while performing on “The Voice” this week.

On Monday night’s (Apr 16) episode during the live quarterfinals, the singer hit the stage to perform “Fighter” with her team members Chris Mann, Ashley De La Rosa, Jesse Campbell, and Lindsey Pavao.

Dressed in a sparkly bustier and black hotpants that showed off her fishnet stocking covered legs, the 31-year-old mother looked like she was trying to re-live her “Dirrty” days in the revealing outfit.

Watch the performance below: