Brad Pitt on Sunday won his first-ever acting Oscar for his supporting role as a laid-back stuntman in Quentin Tarantino's ode to 1960s Tinseltown, "Once Upon a Time... in Hollywood." Pitt bested a field of former Oscar winners: Joe Pesci and Al Pacino for Martin Scorsese's "The Irishman," Anthony Hopkins ("The Two Popes") and Tom Hanks ("A Beautiful Day in the Neighborhood"). "I'm a bit gobsmacked. I'm not one to look back, but this has made me do so," Pitt said to the audience at the Dolby Theatre. "Once upon a time in Hollywood... ain't that the truth." bur-sst/bgs