It wasn't too long ago that Chelsea Handler was making fun of Christina Aguilera not wearing pants to her The Voice co-host, Blake Shelton. Aguilera appeared on Chelsea Lately this week but under one stipulation: Handler had to walk around in a barely-there ensemble as payback for making fun of the pop star's fashion choices.

Later in the interview, Aguilera also revealed that she doesn't like wearing underwear.

"I don't like to wear underwear," Xtina said. "I like to be as free as possible at all times. It's just who I am."

 Check out the full clip below:

[via E! Online]