Sam Smith’s pop-star stock just went up considerably. Smith is still best-known for being the guy who sings Disclosure’s “Latch,” but two nights ago, Taylor Swift played London and brought Smith to the stage to sing his great solo dance-pop single “Money On My Mind,” and that’s a decent sign that the song is about to get really big. The two sang the track as a duet, and it’s pretty clear that Taylor, extra-spunky that night, loves the shit out of the song. (She sounded good on it, too.) Connoisseurs of Taylor’s goofy award-show dancing will find plenty to enjoy here, as well. Watch a fan-made video of the performance below.

The “Money On My Mind” single is out 2/16.

[Photo by Sam Hussein, via Getty Images]