Chrissy Teigen and John Legend Have a Dream Date Night With Adam Levine and Alicia Keys

John Legend and Chrissy Teigen were the center of attention at the Sinatra 100: An All-Star Grammy Concert in Las Vegas on Wednesday. Not only did the couple look fabulous as they posed for the cameras, but a lot of other celebrities got in on the action, too. While Alicia Keys adorably rubbed Chrissy's growing baby bump backstage, Adam Levine got starstruck with his wife, Behati Prinsloo, and singer Katharine McPhee as they sat directly behind the couple. See all the cute snaps ahead, and then check out all the times John and Chrissy brought new meaning to relationship goals.