Last month, Olivia Newton-John extended a special invitation to TODAY's resident "Grease" superfan, Natalie Morales. The singer, songwriter and actress said Morales could come out to Las Vegas, join her on stage as an honorary Pink Lady and sing before a live audience, and that's just what happened.
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"Have you been warming up your voice?" the four-time Grammy winner asked when Morales arrived.
The answer to that was a firm "no," but no worries. Newton-John prepped the anchor for their special performance.
Check out the clip to see how their shared version of "Summer Nights" sounds. And if you want to see Newton-John perform that tune and a medley of her many hits live, check out her "Summer Nights" show at the Flamingo hotel in Vegas.
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