Sabrina Carpenter went full-on Hollywood at Coachella Friday night, trotting out some of the most famous faces in film and starring in her own short movie, while also cranking out her biggest hits. The pop star hit the main stage during night one of the first of 2 weekends at Coachella -- and she drove the packed crowd absolutely nuts with her Hollywood-themed 20-song performance. Speaking of driving, Sabrina kicked things off by starring in a pre-recorded short that featured Sam Elliott as a