WATCH: Embarrassing Oscars 2017 best picture mixup

It was "Moonlight" after all that won this year's Academy Award for best picture, but it was announced only a few minutes after "La La Land" was declared and musical's cast and makers were already on stage.

Presenters Warren Beatty and Faye Dunaway apparently took the wrong envelope—the one for best actress winner Emma Stone—onto the stage. When they read "La La Land" as the winner, representatives for ballot tabulators PwC—formerly Price Waterhouse Coopers—realized the mistake and raced onstage to try to stop the acceptance speeches.

Host Jimmy Kimmel came forward to inform the cast that "Moonlight" had indeed won, showing the inside of the envelope as proof. "I knew I would screw this up," said Kimmel, a first-time host. — with the Associated Press