Moonlight wins best picture, La La Land mistakenly announced as the winner first
Emma Stone and Casey Affleck win best acting awards
Viola Davis and Mahershala Ali win best supporting awards
British stars go home empty-handed
"I love movies, I love being part of movies. Thank you Matt Damon, the whole thing started with you," Lonergan says as he accepts the awards.
Paying tribute to the star of the film, he adds: "Thank you Casey Affleck, Casey Affleck, Casey Affleck."
We are loving this picture Viola Davis has tweeted with her family, who are helping her celebrate her best supporting actress Oscar for her performance in Fences:
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The names of some of the actors, directors, writers, producers, musicians and artists we've lost in the past year are flashed up on the screen as Sara Bareilles performs Joni Mitchell's Both Sides Now.
Mary Tyler Moore, Anton Yelchin, Zsa Zsa Gabor, Om Puri, Debbie Reynolds, Carrie Fisher, and Gene Wilder are among the stars who the Academy pays tribute to.
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Here are just a couple of highlights from the ceremony so far.
First off, the glorious moment when Jimmy Kimmel recreated a Lion King scene with Sunny Pawar.
And then when Denzel Washington 'married' a couple from the tour bus who found themselves unwittingly at the centre of the ceremony.
Image source, Reuters
Image source, ReutersJustin Hurwitz has barely had time to sit down from his previous trophy for best score. He collects this one along with Benj Pasek and Justin Paul.
Pasek thanked his mum for letting him quit playing football and join a school musical instead.
Quote MessageThis is dedicated to all the kids that sing in the rain and all the mums that let them.
Justin thanked his "best friend" Damien Chazelle, who directed La La Land.
Quote MessageI’m so glad I met you. Thanks to the LA musicians who worked on the film. I just put notes on the page - they’re the ones who made it sound beautiful.
Ian Youngs
Entertainment and Arts Reporter, BBC News
Image source, Getty ImagesIs it just me or are we still waiting for this Oscars to get going, two and a half hours in?
Jimmy Kimmel's had some very smart and funny moments, and there has been an undercurrent of political disquiet.
But no major stars have stuck their necks on the line over politics, no film has emerged as the big winner and there have been no huge upsets.
Perhaps that will all change - we're getting to the main awards now.
And here are the nominees
We spoke to the now-Oscar-winning team behind The White Helmets on the red carpet.
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Enjoying the Oscar's tonight. Best for many years.
Scott Beattie
La La Land is impressively underwhelming in every category. I am looking forward to very few wins for this trite film.
Aggie Stretch
Ian Youngs
Entertainment and Arts Reporter, BBC News
In the backstage press room, it helps if you are able to listen to two different things at once.
Journalists can listen to the euphoric winners who come in to answer questions straight after stepping off stage. Or we can listen to the ceremony itself on headsets. Or both.
This set-up can lead to some awkward situations. When Asghar Farhadi's representatives were explaining the best foreign film winner's decision to stay away, they looked puzzled at why their words were being met by laughs from the press.
The laughs came from the media people who were wearing headsets and watching the main ceremony on screens, when unwitting tourists were brought into the auditorium - the funniest moment so far.
Jimmy Kimmel just did a special edition of his popular Mean Tweets feature from his talk show.
He pre-recorded several of tonight's nominees reading out real insulting messages they received on Twitter. Here's just one of them:
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Linus Sandgren takes to the stage to accept the award.
Quote MessageThis film was made with so much love, passion and struggles and it was all thanks to you Damien. You’re a poetic genius and I’m so happy I met you and I really love you man. Emma, Ryan, I think you’re incredible, thanks for all the collaboration.
Ian Youngs
Entertainment and Arts Reporter, BBC News
The Oscars don't normally allow winners to send other people to accept awards on their behalf.
Other people are normally allowed to collect awards only when the winners are unable to attend. Like when they're dead.
The Academy obviously decided to extend this to best foreign film winner Asghar Farhadi, who stayed at home in Iran following Donald Trump's attempted travel ban, even if he could actually have come.
Iranian-American astronaut Anousheh Ansari accepted the award in his place and said backstage that Mr Farhadi's decision to stay away was "very difficult", and "a big deal".
Ex-Nasa scientist Firouz Naderi, who joined her, added: "When you want to stand on your principles, you have to make hard choices."
We now have a first-hand account of that tour bus full of people who unwittingly found themselves in the auditorium of the Oscars a little earlier tonight.
Keith Urban has tweeted this video from the front row:
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"We're more than two hours into the show and Donald Trump hasn't tweeted once, I'm starting to get worried about him," Jimmy Kimmel says, as he live tweets the US President from the stage.
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Image source, Getty Images
Image source, ReutersKhalid Farah, the main subject of The White Helmets - the Syrian first responders who risk their lives to rescue victims from frequent airstrikes - was unable to attend the ceremony, but sent a statement.
Quote MessageWe’re so grateful that this film has highlighted our work to the world. Our organisation is guided by a verse from the Koran - “to save one life is to save all of humanity". We have saved more than 82,000 civilian lives. I invite anyone here who hears me to work on the side of life, to stop the bloodshed in Syria and around the world.
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Jimmy Kimmel just spoke to eight-year-old Sunny Pawar, who he'd spotted in the audience.
The young actor stars in Lion, but Kimmel appeared to mistake the film for The Lion King, as he hoisted Sunny up in the air.
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Image source, Getty ImagesIn a tribute to Back to the Future, Michael J Fox and Seth Rogen - wearing self-tying shoes - along with a time travelling* Delorean have appeared on stage.
*may not actually be able to time travel.