It's the first time black actors have picked up both prizes.
She cried with emotion as she accepted the award.
"This moment is so much bigger than me," she said. "This is for every nameless, faceless woman of colour for whom the door has been opened."
Another legendary black actor, Sidney Poitier, picked up the honorary Oscar for his long career in films.
He's the only other black man ever to have won a best actor Oscar - 35 years ago.
And the best picture was...
The true-life story of a maths genius picked up four awards, including the two most important awards: best picture and best director for Ron Howard.
Something you should be happy about - 55% of you who voted in our vote said you wanted the green one to take the award.