The biggest Oscars twist has come early – and not from a surprise win.

A look of confusion tinged with concern washed over the audience as Eminem popped up on stage for a performance of Lose Yourself, 17 years after it won best original song.

Unlikely choice of entertainment aside, the star was barely recognisable with a full beard and larger build from the lanky, bleach blonde kid who rose to fame in the late 90s.

Idina Menzel confused by Eminem's performance. Photo / Channel 7
Idina Menzel confused by Eminem's performance. Photo / Channel 7
If he didn't sound exactly the same, we'd say this was an impostor. Photo / Getty Images
If he didn't sound exactly the same, we'd say this was an impostor. Photo / Getty Images

Taking the stage following a montage of iconic movie music, Marshall Bruce Mathers, known as Eminem, performed the catchy track with aplomb, but it was the audience who looked as though they'd lost themselves briefly.

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And the award for the greatest reaction goes to Idina Menzel and Billie Eilish:

Billie Eilish and her brother Finneas looked very unsure about the situation. Photo / Channel 7
Billie Eilish and her brother Finneas looked very unsure about the situation. Photo / Channel 7

Over on Twitter, the confused sentiment was echoed: