5 Seconds of Summer performs at the 2014 Billboard Music Awards

5 Seconds of Summer perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada.  

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A few fans even got a kiss!

It's no secret the teenage girls who make up the majority of 5 Seconds of Summer's fans are pretty obsessed with them. 

So when the guys stopped by Jimmy Kimmel Live! Thursday night for their first American talk show appearance, Kimmel -- television's reigning prank king -- couldn't resist having some fun with just a few of the hundreds of girls who lined up outside the studio. 

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A producer explained to the chosen girls that they were trying to break a record of some kind or another, and, one by one, had the young women face a television screen and talk about why they love the band. But then, of course, the guys showed up onscreen -- and wanted a kiss. Naturally, because this is late night television, there was a twist. 

Check it out below (and ponder just how jealous those girls' friends are going to be that they took selfies with the band):