Last night on Jimmy Kimmel Live!, a bevy of stars came together to form a supergroup known as The (RED) Pack, a reference to the HIV/AIDS-fighting organization (RED). Bringing the grand piano-aided, awareness-raising song and dance were DJ Khaled, Halsey, The Killers frontman Brandon Flowers, Kristen Bell, Channing Tatum, Neil Patrick Harris, Julia Roberts and one of (RED)'s biggest spokespeople, Bono.