TheTNT Boysgot the surprise of a lifetime on Tuesday night: a visit fromAriana Grande!
“Oh my God!” exclaimed Francis, dropping to his knees onstage briefly before getting back up to wrap his arms around the “7 Rings” singer in an enthusiastic hug.
Both Mackie and Keifer’s eyes went wide as they attempted to continue singing, the former getting visibly emotional over Grande’s unexpected appearance.
The quartet fell right in vocal step with each other after the initial surprise, with Grande letting the young musicians take the lead on the iconic song and even bowing down to their skills at the conclusion of their impressive performance.
TNT Boys and Ariana Grande.Terence Patrick/CBS

Terence Patrick/CBS

Each of the boys shared photos from their meet and greet with Grande following their joint performance, showing the starry-eyed newcomers posing together backstage with the “Thank U, Next” hitmaker.
“It was so nice to meet and sing with you guys!” she told the group, who hails from the Philippines.
Kevin Mazur/WireImage

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This isn’t the first time Grande, 25, has surprised fans on late-night television. Last May, she offered encouragement to fans with singing aspirations during an appearance onThe Tonight Show.
source: people.com