Kieran Culkin won the best supporting actor Oscar on Sunday for playing a motor-mouthed American tourist in "A Real Pain."

Robert Downey Jr won the Academy Award for best supporting actor for his role in "Oppenheimer," where he played a villainous bureaucrat who seeks to destroy the acclaimed physicist.

Ke Huy Quan, a onetime child star who gave up acting for two decades, and Hollywood veteran Jamie Lee Curtis won Academy Awards on Sunday for their roles in offbeat, dimension-hopping adventure "Everything Everywhere All at Once."