Oops.

The 89th annual Academy Awards went out with a bang – an epic mixup over which film took the Oscar for best picture.

>> 'Moonlight' wins Best Picture after 'La La Land' mistakenly announced

>> Complete list of winners

>> PHOTOS: 2017 Oscars red carpet arrivals

>> PHOTOS: 2017 Oscars show

After Faye Dunaway and Warren Beatty, who were apparently given the wrong winner's card, announced that "La La Land" had won the award, producer Jordan Horowitz made a shocking revelation onstage as the filmmakers were giving their thank-yous: "Moonlight" was the real victor.

Celebrities and fans immediately took to social media to share their reactions.

>> Click here or scroll down to see what they had to say

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Helen Gilbert places flowers on her brother Eurie Martin’s grave at Camp Spring Baptist Church in Sandersville. Her brother died eight years ago. Three former Washington County deputies are accused of causing his death and are set to stand trial Monday. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez