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
It's 21st time lucky for Kevin O'Connell, who has notched up an amazing number of Oscar nominations before winning.
Image source, ReutersSofia Boutella and Chris Evans present this one to Sylvain Bellemare, who was responsible for Arrival's sound.
Hope the La La Land bandwagon starts soon, Fantastic Beasts for Costume was just weird...
Joe McLusky
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Keep your eyes and ears peeled for the next couple of awards in sound editing and sound mixing. If La La Land doesn't win in either it won't break the Oscar records it was tipped to achieve.
The record number of wins in Oscar history is 11 (Titanic, The Lord of the Rings: The Return of the King and Ben-Hur). The record for a musical is 10 (West Side Story).
Image source, Reuters"Our next presenter is an ex-wrestler who is the highest paid actor in the world, which really puts all this into perspective doesn't it?" jokes Kimmel, as he introduces Dwayne "The Rock" Johnson.
Johnson, in turn, introduces Lin-Manuel Miranda and 16-year-old Auli'i Cravalho - the star of Moana - for another best song nominee performance, singing How Far I'll Go.
First political statement, made by [make-up and hairstyling winner] Alessandro Bertolazzi, who reminds everyone he is an Italian immigrant. Won't be the last of these statements.
Nurudeen Sanusi
We're on an ad break right now but up next is the award for documentary feature. The nominees are:
Image source, ReutersColleen Atwood
This is Colleen Atwood's fourth Oscar, after winning in 2011 for Alice in Wonderland, in 2006 for Memoirs of a Geisha and in 2003 for Chicago.
Image source, Getty ImagesMahershala appears to be a popular winner on Twitter:
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Image source, APQuote MessageI wanna thank my teachers and professors, I had so many wonderful teachers, and one thing they consistently told me was that it's not about you, it's about these characters. You're a servant, you're in service to these stories and these characters.
Quote MessageI'm so blessed to have had an opportunity. It was such a wonderful experience, thank you [director] Barry Jenkins, thank you Tarell Alvin McCraney [writer of the play Moonlight was based on]. I also want to thank my wife, we just had our daughter four days ago, so I just want to thank her for being such a soldier through this process and really carrying me through it all. Thank you, peace and blessings.
Successful after his first nomination, Mahershala Ali is the first Muslim actor to win an Oscar.
The first category of the night is actually one of the big ones - best supporting actor. The nominees are:
Ian Youngs
Entertainment and Arts Reporter, BBC News
This is what the red carpet looks like from the next building, which is normally a shopping centre.
You walk through it from the red carpet to the backstage press room, where I am now.
At a quick estimate, there are 250 members of the world's media here, sitting at long desks, all in tuxedos and ballgowns.
The only slight hitch is that on the way from the red carpet to the press room, the sole on my right shoe somehow started coming away and is now barely attached. These shoes are so old - I never wear them because I'm hardly ever this smart.
Luckily the Oscars dress code police haven't noticed yet. I bet this never happens to Ryan Gosling.
Kimmel spots Meryl Streep in the audience and pays tribute to her "many uninspiring and overrated performances", to much laughter from the audience.
Image source, ReutersJimmy Kimmel jokes the ceremony is being watched by "220 countries that now hate us".
"People keep telling me it's time to bring people together, time to unite us, let me say something straight off the top, I can't do that. There's only one Braveheart in this room and he's not going to do that either."
Spotting Mel Gibson in the audience, he added "Mel you look great, I think the Scientology is working."
Warming to his political theme, Kimmel added: "I want to say thank you to President Trump, remember last year when it seemed like the Oscars were racist?"
On a more positive note, he said: "If every person took a minute to reach out to one person you disagree with and have a positive conversation we can make America great again - it starts with us."
Moving to this year's best picture nominees, he says this was the year that "black people saved Nasa and white people saved jazz" - references to Hidden Figures and La La Land.
He topped off mentioning the best picture nominees by adding: "Manchester By The Sea, that was a fun movie wasn't it?"
Host Jimmy Kimmel takes to the stage, joking: "Oh good I got a sitting ovation, awesome!"
Coming off the back of Timberlake's performance, he added: "Justin was terrific and I want to say I really hope the other guys from NSync were watching that performance because if they were I think there's a really good chance they're going to let you back in the band."
Ian Youngs
Entertainment and Arts Reporter, BBC News
Every few seconds, a cheer goes up from the fans in the bleachers on the main strip of the red carpet. At the end I can see, there's a group of US service personnel in uniform, who are having the time of their lives.
Each cheer means another A lister is about to come around the corner.
We've had Emma Stone, Ryan Gosling, Dev Patel (with his mum), Michelle Williams, Scarlett Johansson, Mel Gibson and many more come, wait in line for the photogtaphers, chatting among themselves, before walking forward and posing for a minute or two each.
And in the background is a voice over the public address system telling everybody to take their seats.
Here we go!...