Stars are starting to arrive for the British Academy Film Awards at London's Royal Albert Hall.
Producer Graham Broadbent said the movie is "the story of a woman taking on the establishment and status quo".
"We believe that this is a moment in time when we can harness our collective energies to dismantle the wall of silence that surrounds violence against women and girls", they say.
While it was the actors and directors taking home the awards, it was the Time's Up movement against sexual harassment and bullying and #MeToo campaign that dominated the night.
"This is a film that is a hopeful one in lots of ways, but it is also an angry one", he said.
"And as we've seen this year, sometimes anger is the only way to get people to listen and to change, so we're thrilled that Bafta has recognised this".
The British-produced "Three Billboards" has nominations for best film, director and original screenplay for McDonagh, while Frances McDormand is up for leading actress, and Sam Rockwell and Woody Harrelson for best supporting actors.
Allison Janney won best supporting actress for her role as the mother of controversial figure skater Tonya Harding in biopic "I, Tonya".
"The Shape of Water" - the most heavily nominated film of the night with 12 nods - came away with only three awards, including best director for Guillermo Del Toro, while "Darkest Hour" claimed two prizes, including for Gary Oldman as best actor.
Backed by more than 190 entertainers, academics and activists, the letter aligns British film stars with the fight against sexual harassment set off by the allegations against USA movie producer Harvey Weinstein.
The movement has spread throughout the western world including in Britain where Kevin is now under investigation for sexual crimes as well as Weinstein, who is under the watch of police following nine claims of assault.
The red carpet will be a sea of black as the movement against sexual misconduct takes center stage at the British Academy Film Awards.
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Several actresses brought feminist activists as guests, and men showed solidarity with "Time's Up" lapel pins.
She said "wearing black is another manifestation of saying 'We don't want the world to continue as it has been".
"It's incredibly important that people are being vocal about what is happening", she said.
Actresses Naomie Harris, Tessa Thompson and Gemma Arterton were among the stars joined by activists campaigning against sexual harassment and gender inequality.
"It's more likely we'll see an alien onscreen than we'll see an Asian woman at the moment, which is disgraceful", Riseborough said. Kensington Palace declined to comment on Kate's decision to wear green instead of black in solidarity with other women. Typically, the royal family stays out of politics, but one would assume they'll also wear black as a testament to the strengthening of sexual abuse victims' resolve.
Earlier in the day more than 200 women signed on to a new fund to support women who experience abuse and harassment at work.
The letter in The Observer calls for an end to impunity and says "this movement is bigger than just a change in our industry alone".
Former "Harry Potter" star Watson has given the fund 1 million pounds ($1.4 million), according to its page on the Go Fund Me website. Filmmaker James Ivory, 89, took the adapted screenplay prize for "Call Me By Your Name".
Princess Kate accompanied William, who is president of BAFTA, and also wore a glittering matching emerald and diamond necklace to the Awards ceremony.
British star Daniel Kaluuya, also nominated for leading actor for Get Out, picked up the EE Rising Star award, which was voted for by the public.
Janney is also up for an Academy Award at the Oscars on March 4.