South Korean film Parasite has been named best picture at this year's Oscars, becoming the first non-English language film to scoop the top prize.
Director Bong Joon-ho beat Sir Sam to the prize for best director, and also took the best original screenplay award.
Parasite is a black comedy thriller film released in 2019, that chronicles the story of members of a poor family who scheme to become employed by a wealthy family by infiltrating their household and posing as unrelated, highly qualified individuals.
1917 had been the favourite to win best picture, but its awards all came in the technical categories.
Meanwhile Renee Zellweger won best actress for playing Judy Garland in Judy, while Joaquin Phoenix, who was favourite to win, was named best actor for Joker.
Brad Pitt and Laura Dern won the supporting acting awards for their roles in Once Upon A Time in Hollywood and Marriage Story respectively.
Dern won the award a day before her 53rd birthday.
Brad Pitt got political
Brad Pitt won the first acting Oscar of his career. He was the first winner of the night, and immediately used his speech to attack the way the impeachment proceedings against US President Donald Trump were handled.
He said: “They told me I only have 45 seconds up here, which is 45 seconds more than the Senate gave John Bolton this week.”
“I'm thinking maybe Quentin does a movie about it and in the end the adults do the right thing."
He referred to the fact that Republican senators voted against allowing witnesses including former National Security Adviser John Bolton to give evidence.
The 56-year-old moved from the political to the personal, paying tribute to, and dedicating his award to his kids, whom he said colour everything he does.
He also paid tribute to Tarantino, whom he described as an original and one of a kind. Adding that the film industry would be a much drier place without him.
He celebrated co-star Leonardo DiCaprio and reflected on his journey in a career that spans more than two decades.
"I am a bit gobsmacked. I'm not one to look back, but this has made me do so," he said.
Other awards on the night
Sir Elton John won his second Oscar of his career alongside songwriting partner Bernie Taupin. The duo won best original song for (I'm Gonna) Love Me Again from Rocketman. He first won an Oscar for The Lion King 25 years ago.
Composer Hildur Gudnadottir became the first female winner of best original score for the Joker since 1998 and former American football player Matthew A Cherry won best animated short film for Hair Love.
Cherry dedicated the award to late basketball star and past Oscar winner Kobe Bryant, saying: "May we all have a second act as great as his was."
Actress Janelle Monae opened up the awards with a saucy performance.
She said that the performance was about celebrating all the women who directed phenomenal films.
Steve Martin and Chris Rock came on as a double act and delivered what looked like the traditional opening monologue before calling on a number of celebrities to announce each award.
Full list of winners
Winner: Renee Zellweger – Judy
Winner: Joaquin Phoenix – Joker
Best supporting actress
Winner: Laura Dern - Marriage Story
Best supporting actor
Winner: Brad Pitt - Once Upon A Time in Hollywood
Winner: Parasite - Bong Joon-ho
Best original screenplay
Winner: Parasite - Bong Joon-ho & Han Jin Won
Best adapted screenplay
Winner: Jojo Rabbit - Taika Waititi
Best animated feature
Winner: Toy Story 4
Best documentary feature
Winner: American Factory
Best international feature
Winner: Parasite - South Korea
Best original song
Winner: (I'm Gonna) Love Me Again - Rocketman (Elton John & Bernie Taupin)
Best original score
Winner: Joker - Hildur Guðnadóttir
Winner: 1917 - Roger Deakins
Best visual effects
Winner: 1917 - Guillaume Rocheron, Greg Butler & Dominic Tuohy
Best film editing
Winner: Ford v Ferrari - Michael McCusker & Andrew Buckland
Best costume design
Winner: Little Women - Jacqueline Durran
Best sound editing
Winner: Ford v Ferrari - Donald Sylvester
Best sound mixing
Winner: 1917 - Mark Taylor & Stuart Wilson
Best production design
Winner: Once Upon A Time in Hollywood - Barbara Ling & Nancy Haigh
Best make-up and hairstyling
Winner: Bombshell - Kazu Hiro, Anne Morgan & Vivian Baker
Best live action short
Winner: The Neighbors' Window
Best animated short
Winner: Hair Love
Best documentary short
Winner: Learning to Skateboard in a Warzone (If you’re a girl)