LOS ANGELES -- "Oppenheimer," a solemn three-hour biopic that became an unlikely billion-dollar box-office sensation, was crowned best picture at a 96th Academy Awards that doubled as a coronation for Christopher Nolan.

The most closely watched contest of the Academy Awards went to Emma Stone, who won best best actress for her performance as Bella Baxter in "Poor Things." In what was seen as the night's most nail-biting category, Stone won over Lily Gladstone of "Killers of the Flower Moon." Gladstone would have become the first Native American to win an Academy Award.

Instead, Oscar voters couldn't resist the full-bodied extremes of Stone's "Poor Things" performance. The win for Stone, her second best actress Oscar following her 2017 win for "La La Land," confirmed the 35-year-old as arguably the preeminent big-screen actress of her generation.

Here are the most memorable moments from the 96th Academy Awards and the hottest Oscar after parties.

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Hayley FitzPatrick, Carson Blackwelder, Angeline Jane Bernabe, Shafiq Najib, and Mason Leibvia with "Good Morning America" contributed to this report.