Hollywood's A-list stars gathered at the Hollywood & Highland Centre on 26 February 2017 for the 89th Annual Academy Awards. In this gallery, IBTimesUK presents some of the best photos from the glamorous ceremony:

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Brie Larson arrivesMario Anzuoni/Reuters
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Janelle Monae attends the 89th Annual Academy AwardsChristopher Polk/Getty Images
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Ryan Gosling arrives on the red carpetValerie Macon/AFP
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Viola Davis and her husband, producer Julius Tennon arrive on the red carpetTommaso Boddi/AFP
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Janelle MonaeChristopher Polk/Getty Images
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Director of La La Land, Damien Chazelle arrives on the red carpetRobyn Beck/AFP
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Octavia SpencerMario Anzuoni/Reuters
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Taraji P. HensonFrazer Harrison/Getty Images
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Actor Leslie Mann arrives on the red carpetChristopher Polk/Getty Images

As they walked the red carpet, many attendees were seen wearing a blue ribbon on their gowns and tuxedos to show support for the American Civil Liberties Union, an advocacy group that worked to get President Donald Trump's travel ban blocked in US courts. Others, including Emma Stone and Scarlett Johnson wore pins in support of Planned Parenthood, a reproductive healthcare group that Trump has pledged to defund because it provides abortions.

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Ruth Negga is seen wearing a blue ribbon in support for the American Civil Liberties UnionMike Blake/Reuters
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Emma Stone is seen wearing a pin in support of Planned Parenthood (L)Frazer Harrison/Getty Images
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Scarlett JohanssonMario Anzuoni/Reuters

African-American coming-of-age tale "Moonlight" won the Oscar for best picture following a mishap that caused uproar and confusion after presenters Warren Beatty and Faye Dunaway initially announced that romantic musical "La La Land", the presumed favourite for best picture, had won. Accountants Price Waterhouse Cooper, who oversee the ballots, said the presenters had mistakenly been given the wrong category envelope. "We are currently investigating how this could have happened, and deeply regret that this occurred."

"La La Land" went into the Oscars with a leading 14 nominations and emerged with six, including for its score and theme song "City of Stars." "La La Land" director Damien Chazelle, 32, became the youngest person to ever win a best director Oscar.

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Viola Davis accepts the Best Supporting Actress award for 'Fences'Christopher Polk/Getty Images
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Viola Davis delivers a speech on stage after she won the award for Best Supporting Actress in 'Fences'Mark Ralston/AFP
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Leonardo DiCaprio greets Emma Stone, winner of Best Actress for 'La La Land'Christopher Polk/Getty Images
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Emma Stone, winner of Best Actress for 'La La Land'Frazer Harrison/Getty Images
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Faye Dunaway and Warren Beatty speak onstageKevin Winter/Getty Images
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'La La Land' producer Jordan Horowitz (lower left) stops the show to announce the actual Best Picture winner as 'Moonlight' following a presentation errorKevin Winter/Getty Images
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Producer Jordon Horowitz holds up the card for the Best Picture winner MoonlightLucy Nicholson/Reuters
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Cast and crew of 'Moonlight' celebrate the win for Best PictureChristopher Polk/Getty Images
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Joi McMillon of film Moonlight reacts during presentation of Best PictureLucy Nicholson/Reuters

Viola Davis won Best Supporting Actress for her role as a long suffering housewife in African-American family drama "Fences" while Mahershala Ali won the best supporting actor for his role as a drug-dealing mentor in the independent drama "Moonlight." Elsewhere, Emma Stone won her first Oscar for her lead role as a struggling actress who falls in love with a jazz musician in musical romance "La La Land." "Manchester by the Sea" star Casey Affleck was named best actor.

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Damien Chazelle kisses his partner Olivia Hamilton after he won the Best Director award for 'La La Land'Mark Ralston/AFP
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Casey Affleck accepts the Best Actor award for 'Manchester by the Sea'Christopher Polk/Getty Images
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Mahershala Ali accepts the Best Supporting Actor award for 'Moonlight' from Alicia VikanderChristopher Polk/Getty Images
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Scarlett Johansson presents Best Original Song winner 'City of Stars'Lucy Nicholson/Reuters
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Justin Hurwitz, Benj Pasek and Justin Paul wins the Oscar for Best Original Song 'City Of Stars' from 'La La Land'Lucy Nicholson/Reuters
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Taraji P. Henson, Octavia Spencer and Janelle Monae present for Best Documentary FeatureLucy Nicholson/Reuters
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Mahershala Ali, winner of Best Supporting Actor for 'Moonlight,' Emma Stone, winner of Best Actress for 'La La Land,' Viola Davis, winner of the Best Supporting Actress award for 'Fences,' and Casey Affleck, winner of Best Actor for 'Manchester by the Sea,' stand in the press roomFrazer Harrison/Getty Images