Much to everyone's shock, Eminem took the stage at the 2020 Oscars Sunday night.

For the act, the rapper chose to perform which won the Oscar for Best Original Song back in 2003 after appearing in his 2002 film, . The unexpected performance comes less than a month after Eminem dropped a surprise album entitled .

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Given that no one seemed to know about Eminem's cameo, many couldn't hide their shock seeing the rapper back on stage, most notably Idina Menzel and Billie Eilish.

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When it’s 2020 and Eminem is performing at the Oscars. #Oscars pic.twitter.com/dQmNLXFSWG — Mike Pisa-Kino 🔑🚫 (@RMRCyborgMike) February 10, 2020

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Billie Eilish and Idina Menzel is everyone wondering why Eminem is performing at the #Oscars. pic.twitter.com/voginNZgW3 — Braddington (@bradwhipple) February 10, 2020

Then again, some celebrities, like Kelly Marie Tran, seemed to be absolutely living for the throwback performance.

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Kelly Marie Tran rapping along to Eminem's "Lose Yourself" at the #Oscars #Oscars2020 pic.twitter.com/fZmWYsqEkX — Daily Kelly Marie Tran (@tranIoan) February 10, 2020

The crowd's varying facial expressions aside, everyone gave Eminem an enthusiastic standing ovation after he was done, which tells us the majority of the audience was loving it (including Idina and Billie, who started to dance after the initial shock wore off).

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Lose yourself. The #Oscars crowd gives @Eminem a standing ovation after the surprise performance of his Oscar-winning song from '8 Mile' https://t.co/GsTAC6owzz pic.twitter.com/JPAAkG1O0h — The Hollywood Reporter (@THR) February 10, 2020

After taking the stage, Eminem hopped on Twitter to show his gratitude for getting the opportunity to perform at the 92nd Academy Awards ceremony. It meant a lot to him, especially considering when he won the Oscar for "Lose Yourself" back in 2003, he didn't come to the ceremony to accept it. In an interview, Eminem revealed that he was at home "sleeping" during the Oscars because he didn't feel like he had a chance of winning.

"Look, if you had another shot, another opportunity... Thanks for having me @TheAcademy. Sorry it took me 18 years to get here," the rapper tweeted alongside footage from the moment the song won at the 2003 Oscars.

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Look, if you had another shot, another opportunity... Thanks for having me @TheAcademy. Sorry it took me 18 years to get here. pic.twitter.com/CmSw2hmcZo — Marshall Mathers (@Eminem) February 10, 2020

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Kayla Keegan News and Entertainment Editor Kayla Keegan covers all things in the entertainment, pop culture, and celebrity space for Good Housekeeping.

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