Eminem made a surprise appearance and performed "Lose Yourself," a best original song winner in 2003 from the soundtrack to "8 Mile." His performance rocked the Dolby Theatre -- "Joker's" Zazie Beetz was among the many who rapped along, and singer-songwriter Billie Eilish watched with her jaw dropped.
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The appearance was a big deal for the awards show after Eminem didn't perform as a nominee in '03. In a tweet after his performance, he referenced the 2003 show: "Look, if you had another shot, another opportunity... Thanks for having me @TheAcademy Sorry it took me 18 years to get here."
His math was a bit off, though. Barbra Streisand announced "Lose Yourself" as the Oscar winner in 2003. Mathers didn't attend the ceremony to collect his trophy as the songwriter.
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Backstage producer Lynette Howell Taylor was especially excited, save for a momentary panic that he didn't have his mic. Afterward, she squealed "We did it!" Fitting for a performance that required a few bleeps, Howell Taylor also let out some expletives of her own in excitement.
Lin-Manuel Miranda introduced a package of clips showing off the use of pop music in films before a bearded Eminem rose from beneath the stage to perform.
The rapper got a standing ovation when he finished. Several other audience members were shown rapping along or bobbing to the beat in their seats, including actress Kelly Marie Tran and musician-actress Janelle Monae, who opened the show.
Director Martin Scorsese wasn't one of them. He appeared to briefly close his eyes when the cameras found him in the crowd.
The Associated Press contributed to this report.