LAS VEGAS, NV - DECEMBER 02: Adam Levine and Behati Prinsloo pose backstage during "Sinatra 100: An All-Star GRAMMY Concert" celebrating the late Frank Sinatra's 100th birthday at the Encore Theater at Wynn Las Vegas on December 2, 2015 in Las Vegas, Nevada. The show will air on CBS on December 6. (Photo by Kevin Mazur/WireImage)
