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Susan Boyle, Dancing with the Stars Performances, DWTS

ABC

It was a moment all right—though whether there's chemistry, we'll let you be the judge.

Susan Boyle joined Donny Osmond at his headlining gig Wednesday night at the Flamingo Hotel in Las Vegas for a duet of "This Is the Moment."

The appearance marked the Sin City debut for the Britain's Got Talent star who, when she wasn't dueting with her all-time idol, also performed a solo rendition of "Who I Was Born To Be" (they also performed "This Is the Moment" on Tuesday night's Dancing With the Stars).

Boyle also recorded two ditties for Osmond's new album, Standing Ovation: The Greatest Songs From the Stage, dropping Nov. 13.

All we can say is: Who needs Marie?!