Robert Downey Jr. wins his first Oscar!

Robert Downey Jr. earns his first Academy Award for Best Supporting Actor in "Oppenheimer," playing Lewis Strauss, head of the Atomic Energy Commission.

The film, with 13 nominations, including Best Picture, sees co-star Cillian Murphy also up for Best Actor.

Downey's Oscar win tops off a triumphant awards season, with victories at the Golden Globes, BAFTA, and SAG Awards.

Downey, who won Best Supporting Actor for 'Oppenheimer,' acknowledged his past struggles in his acceptance speech,"I'd like to thank my terrible childhood and the Academy, in that order," Downey joked before he saluted his wife Susan, who he said found him as a "snarly rescue pet" and "loved him back to life."

Fans rejoiced at his transformation, heralding it as one of Hollywood's most remarkable comebacks.

📸 Via Mike Blake/Reuters