British actress Olivia Colman defied the odds to scoop an Oscar on a night when Green Book also sprung a surprise by winning the award for best film.
Colman won best actress for her role in The Favourite and charmed viewers with a funny and tearful speech.
Green Book won three trophies in total, including best picture, which had been expected to go to Netflix's Roma.
Bohemian Rhapsody won the most awards in total with four, while Roma and Black Panther also won three each.
This year's Academy Awards was handed out in Los Angeles - here's a complete list of all the winning and nominated stars and films.
Best picture
Winner: Green Book
BlacKkKlansman
Black Panther
Bohemian Rhapsody
The Favourite
Roma
A Star Is Born
Vice
Best actress
Winner: Olivia Colman - The Favourite
Glenn Close - The Wife
Yalitza Aparicio - Roma
Lady Gaga - A Star Is Born
Melissa McCarthy - Can You Ever Forgive Me?
Best actor
Winner: Rami Malek - Bohemian Rhapsody
Christian Bale - Vice
Bradley Cooper - A Star Is Born
Willem Dafoe - At Eternity's Gate
Viggo Mortensen - Green Book
Best supporting actress
Winner: Regina King - If Beale Street Could Talk
Amy Adams - Vice
Marina de Tavira - Roma
Emma Stone - The Favourite
Rachel Weisz - The Favourite
Best supporting actor
Winner: Mahershala Ali - Green Book
Adam Driver - BlacKkKlansman
Sam Elliott - A Star Is Born
Richard E Grant - Can You Ever Forgive Me?
Sam Rockwell - Vice
Best director
Winner: Alfonso Cuaron - Roma
Yorgos Lanthimos - The Favourite
Spike Lee - BlacKkKlansman
Adam McKay - Vice
Pawel Pawlikowski - Cold War
Best original screenplay
Winner: Green Book - Nick Vallelonga, Brian Currie and Peter Farrelly
The Favourite - Deborah Davis and Tony McNamara
First Reformed - Paul Schrader
Roma - Alfonso Cuarón
Vice - Adam McKay
Best adapted screenplay
Winner: BlacKkKlansman - Charlie Wachtel, David Rabinowitz, Kevin Willmott and Spike Lee
The Ballad of Buster Scruggs - Joel Coen and Ethan Coen
Can You Ever Forgive Me? - Nicole Holofcener and Jeff Whitty
If Beale Street Could Talk - Barry Jenkins
A Star Is Born - Eric Roth, Bradley Cooper and Will Fetters
Best animated feature
Winner: Spider-Man: Into the Spider-Verse
Incredibles 2
Isle of Dogs
Mirai
Ralph Breaks the Internet
Best foreign language film
Winner: Roma - Mexico
Capernaum - Lebanon
Cold War - Poland
Never Look Away - Germany
Shoplifters - Japan
Best documentary feature
Winner: Free Solo
Hale County This Morning, This Evening
Minding the Gap
Of Fathers and Sons
RBG
Best original song
Winner: Shallow (A Star Is Born) - Lady Gaga, Mark Ronson, Anthony Rossomando and Andrew Wyatt
All The Stars (Black Panther) - Mark Spears, Kendrick Lamar, Duckworth and Anthony Tiffith and Solana Rowe
I'll Fight (RGB) - Diane Warren
The Place Where Lost Things Go (Mary Poppins Returns) - Marc Shaiman and Scott Wittman
When A Cowboy Trades His Spurs for Wings (The Ballad of Buster Scruggs) - David Rawlings and Gillian Welch
Best original score
Winner: Black Panther - Ludwig Goransson
BlacKkKlansman - Terence Blanchard
If Beale Street Could Talk - Nicholas Britell
Isle of Dogs - Alexandre Desplat
Mary Poppins Returns - Marc Shaiman, Scott Wittman
Best production design
Winner: Black Panther - Hannah Beachler and Jay Hart
The Favourite - Fiona Crombie and Alice Felton
First Man - Nathan Crowley and Kathy Lucas
Mary Poppins Returns - John Myhre and Gordon Sim
Roma - Eugenio Caballero and Barbara Enriquez
Best costume design
Winner: Black Panther - Ruth E Carter
The Ballad of Buster Scruggs - Mary Zophres
The Favourite - Sandy Powell
Mary Poppins Returns - Sandy Powell
Mary Queen of Scots - Alexandra Byrne