Usher debuted yesterday as the latest celebrity to model in an ad campaign for the menswear division of Kim Kardashian's SKIMS brand. “Kim’s been a longtime friend of mine who’s always been so supportive of my work, so the opportunity to collaborate together on a campaign that supports both of our highly anticipated launches made total sense,” Usher said in a statement. “Launching this campaign ahead of multiple career milestones feels like a full circle moment, with SKIMS.” The singer stripped to his underwear for the sexy new campaign, showing off SKIMS' Stretch 5″ Boxers ($52) and the Cotton 3″ Boxer Brief ($18). The brand will also be offering an exclusive version of Usher’s new album, Coming Home, including a bonus track. His Super Bowl Halftime Show is coming this Sunday.