The Jonas Brothers were starstruck on “The Tonight Show with Jimmy Fallon” Thursday … no, it wasn’t a celeb who had their jaws on the floor — it was the man whose résumé was being examined in the crowd at their show!

Here’s the deal … a video started blowing up on TikTok earlier this week when someone filmed a concertgoer reviewing Scott’s CV at the JoBros show.

Several celebs — including Nick Jonas and even Paddington Bear’s official TikTok — commented on the video, praising Scott … and Jimmy Fallon surprised the brothers with him on the show.

Check out the clip … the three brothers have no idea Scott’s at the taping that night — and Joe Jonas looks particularly shocked to hear they’re going to meet the man behind the internet hype.

Scott comes out and shakes hands with Nick and Kevin Jonas — though Joe pulls him in for a hug instead — and Scott tells Fallon he didn’t believe it when his friend told him he was blowing up on TikTok. Kelly downloaded TikTok to find out whether the rumors were true … and, shockingly, he reveals he never actually applied for a job anyway.

Kelly says he actually does know the person looking at his résumé, though … he says the two served at the same military base back in 2014 — and they’ve now reconnected because of the clip. Small world.

Scott had one last surprise for the brothers … admitting he didn’t know who they were prior to the viral TikTok. He didn’t watch Disney Channel growing up and swears his wife had to explain them to him.