Kieran Culkin won the best supporting actor Oscar on Sunday for playing a motor-mouthed American tourist in "A Real Pain." A star of the HBO program "Succession," Culkin was a heavy favorite to win after sweeping BAFTA,

Before competing against one another for Bets Supporting Actor at Sunday's 97th Academy Awards ceremony, Kieran Culkin and Jeremy Strong starred together as co-stars for five seasons on HBO's Succession,

Kieran Culkin tried to quit the role of a lifetime. The actor took home the Academy Award for Best Supporting Actor on Sunday night for his performance in "A Real Pain" — a role that also won him a Golden Globe,