Actors Brad Pitt (L) and Leonardo DiCaprio and attend the premiere of Quentin Tarantino-directed film "Once Upon a Time in Hollywood" during the 72nd Cannes Film Festival in Cannes, France, May 21, 2019. "Once Upon a Time in Hollywood" will compete for the Palme d'Or with other 20 films. (Xinhua/Gao Jing)