'Oppenheimer' crowned best picture at the Oscars

"Oppenheimer," the blockbuster biopic about the race to build the first atomic bomb, claimed seven Academy Awards including the prestigious best picture trophy on Sunday as Hollywood celebrated a triumphant year in film.

Irish actor Cillian Murphy won best actor for playing theoretical physicist J. Robert Oppenheimer, leader of the US effort in the 1940s to create a weapon that ended World War II. Oppenheimer director Christopher Nolan took home the directing Oscar.

"We made a film about the man who created the atomic bomb, and for better or worse we are living in Oppenheimer's world," Murphy said as he held his trophy on stage. "So I would really like to dedicate this to the peacemakers everywhere."

A three-hour historical drama about science and politics, Oppenheimer became an unlikely box office hit and grossed $953.8 million, in addition to widespread critical praise. It was the first of Nolan's films to win best picture. The director has previously won acclaim for The Dark Knight Batman trilogy, Inception, Memento and other movies.

As he accepted his gold statuette, Nolan noted that the movie business was a century old and still evolving. "To know you think I'm a meaningful part of this means the world to me," he said.

Emma Stone wins Best Actress

Emma Stone was named best actress for playing a woman revived from the dead in the dark and wacky comedy Poor Things. It was the second Academy Award for Stone, who landed the best actress honour for 2016 musical La La Land.

"This is really overwhelming," she said on stage.

The best actress race had been considered one of the tightest competitions with Lily Gladstone nominated for Killers of the Flower Moon. Had she prevailed, Gladstone would have been the first Native American to win an acting Oscar.

In supporting actor categories, Robert Downey Jr. of Oppenheimer and The Holdovers star Da'Vine Joy Randolph claimed their first Academy Awards. Downey, who was nominated for an Oscar in 1993, won his honour on Sunday for playing Oppenheimer's professional nemesis, Lewis Strauss.

"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".

Randolph received the best supporting actress trophy for playing a grieving mother and cafeteria worker in the comedy set in a New England boarding school. "For so long, I always wanted to be different, and now I realise I just need to be myself," she said. "I thank you for seeing me."

Winners were chosen by the roughly 10,500 members of the Academy of Motion Picture Arts & Sciences.

After 2023 was marred by labour strikes by actors and writers, the Oscars gave Hollywood a chance to celebrate two blockbusters, Oppenheimer and Barbie, which brought in a combined $2.4 billion at theaters and made movies the center of pop culture last summer.

Barbie ended the night with one Oscar.

Billie Eilish and Finneas O'Connell landed best original song for the ballad What Was I Made For? The pair had performed the song on stage earlier with Eilish singing at a microphone next to O'Connell, her brother and co-writer, on piano.

Ryan Gosling donned a hot pink suit, gloves and a cowboy hat to belt out rock ballad I'm Just Ken, surrounded by male dancers dressed in black.

Strong silhouettes, black, sparkles dominate Oscars red carpet

On the red carpet, stars strutted in strong silhouettes, sparkles and a splash of Barbie-inspired pink.

Talk show host Jimmy Kimmel, hosting the show for the fourth time, opened the ceremony by complimenting, and taking jabs at, many of the nominees and their films.

The comedian praised Barbie, the pink-drenched doll adventure, for remaking a "plastic doll nobody even liked anymore" into a feminist icon.

Kimmel said many of this year's movies were too long, particularly Martin Scorsese's 3-1/2-hour epic Killer of the Flower Moon. "In the time it takes you to watch it, you could drive to Oklahoma and solve the murders," Kimmel joked.

Late in the show, he read aloud from a scathing online review of his performance as host, disclosing at the end that it was written by former US President Donald Trump.

Kimmel jokingly asked the audience to guess which former president had written the post and then quipped: "Thank you, President Trump. Isn't it past your jail time?"

Here's the full list of winners

• Best Picture: Oppenheimer
• Best Actor: Cillian Murphy, Oppenheimer
• Best Actress: Emma Stone, Poor Things
• Best Director: Christopher Nolan, Oppenheimer
• Best Supporting Actor: Robert Downey Jr., Oppenheimer
• Best Supporting Actress: Da’Vine Joy Randolph, The Holdovers
• Best Adapted Screenplay: American Fiction
• Best Original Screenplay: Anatomy of a Fall
• Best Animated Feature Film: The Boy and the Heron
• Best Animated Short: War is Over! Inspired by the Music of John & Yoko
• Best International Feature: The Zone of Interest, United Kingdom
• Best Documentary Feature: 20 Days in Mariupol
• Best Documentary Short: The Last Repair Shop
• Best Original Score: Oppenheimer
• Best Original Song: What Was I Made For?, Barbie
• Best Sound: The Zone of Interest
• Best Production Design: Poor Things
• Best Live Action Short: The Wonderful Story of Henry Sugar
• Best Cinematography: Oppenheimer
• Best Makeup and Hairstyling: Poor Things
• Best Costume Design: Poor Things
• Best Visual Effects: Godzilla Minus One
• Best Film Editing: Oppenheimer