This Is Halloween

Nick Jonas hosted a party at 1 OAK Nightclub in the Mirage Hotel and Casino in Las Vegas on Friday night, October 31. Dressed in a 1920s/Great Gatsby themed outfit, he was on hand to judge $20k Halloween costume contest.

Nick was joined by his girlfriend, Olivia, who was also dressed in a 1920s themed outfit. Earlier in the evening, Nick and Olivia took in Britney Spears show at Planet Hollywood.

What were you for Halloween?