Inside Shawn Mendes' intimate Rolling Stone concert for YouTube Music

Shawn Mendes was the youngest -- and coolest -- guy in the room Thursday night in Brooklyn, where the teen heartthrob performed at Rolling Stone's relaunch party presented by YouTube Music.

The buzzy event was a hit with guests, who entered the converted warehouse through a back entrance boasting massive replicas of iconic Rolling Stone covers, from Springsteen to Styles and everywhere in between.

Mendes was introduced onstage by the also-young (and also cool) Gus Wenner, Rolling Stone's president and COO, who took leadership of the company in 2016 at age 26.

Things got a bit warm outside the warehouse, but if the sweaty Mendes was bothered, he didn't let on, powering through more than a dozen songs including "Nervous" and "Fallin All In You." He also performed his mass-hit staples -- "In My Blood," "There's Nothin Holding Me Back," "Stitches," "Treat You Better" and "Mercy." Not a bad repertoire at 19.

The crowd particularly loved Mendes' a cappella finish on "Youth," which he certainly won't be able to do on his upcoming arena tour, where tens of thousands of fans will be screaming their affections. (BTW, if you're looking to get a Christmas gift squared away early, tickets are on sale now. You're welcome.)

Bummed about missing out? No worries -- the intimate show will air on Artists Den later this year.