LAS VEGAS, NV - DECEMBER 02: Singers Alicia Keys (L) and John Legend (R) and model Chrissy Teigen (C) 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 Lester Cohen/WireImage)
