Gwen Stefani hit the stage for a performance of "Looking Hot" on Jimmy Kimmel Live! in LA last night. She flashed her abs during the show, which was Jimmy's first in his new time slot and also featured an interview with Jennifer Aniston. No Doubt got together to rehearse for the spot on Sunday, after Gwen and her family returned to the West Coast after their stay in London. The Stefani-Rossdales celebrated the holidays in Gavin Rossdale's hometown after wrapping up a busy 2012 that included the release of No Doubt's sixth album and Gavin's world tour with Bush. Now Gwen and Gavin are getting back to their LA routine and were spotted grabbing coffee together on Monday.