Pictures of Nick Lachey and Vanessa Minnillo in Costume

Nick Lachey and Vanessa Minnillo got dressed up for a friend's birthday party at Beso in Hollywood on Saturday. Nick chose a '70s wig for the event and Vanessa was decked out in '80s gear while other stars donned '20s costumes for Eva Longoria's bash across town. The duo's fun night out coincided with the release of Nick's new single, "Last One Standing," which is the fight song for the NCAA Big East Conference as they head into March Madness. Nick's gearing up for the college basketball tournament and Vanessa's heading to NYC, but they're still moving forward with plans for their upcoming nuptials. Nick's made it clear that he doesn't plan on singing at the event, though, saying, "I think I'll leave the wedding songs to somebody else."