Gwen Stefani covered up a black and white outfit with a cape as she headed out in London today. She's back to her stylish self after changing up her look for Halloween. Gwen was a bloody Sandy from Grease to attend Jonathan Ross's party with her bandmate Tony Kanal, Helena Bonham Carter, Kate Moss, and others. Before enjoying her own spooky night, Gwen took Zuma trick-or-treating in his Star Wars Stormtrooper suit. In the midst of preparing for Halloween, Gwen made sure to place her vote in the upcoming presidential race. She's just one of many celebrities getting involved in the election, which officially takes place on Tuesday.