Getty Images, Getty Images

Here’s Video Proof That Ashton And Calum From 5SOS Are Hardcore Beliebers

Watch the guys jam hard to 'Baby' at JB's concert

On Wednesday, Justin Bieber wrapped up a three-night, sold-out residency at L.A.’s Staples Center for his Purpose World Tour, where pretty much everyone who’s anyone caught a glimpse of the action. His No. 1 fan, Kanye West? Check. A blonde-wigged Kylie Jenner? Check. Big Sean? Check. Even Bieber’s ex Selena Gomez? Yep, check.

Among the most enthusiastic of celebrity guests, however, were 5 Seconds of Summer bandmates Ashton Irwin and Calum Hood, who couldn’t resist catchy Bieber’s rainy spectacle. And lest you think they’re only casual “fans” who just showed up for a free night out, the two Aussies proved they’re bonafide Beliebers at heart by sharing a vid of them jamming out to “Baby.”

OK, true, you’d be hard-pressed to find anyone in the world who can’t sing the “Baby” chorus off the top of their head (“Baby, baby, baby, ooooh” isn’t exactly a brain-bender), but dammit, Ash and Cal sang it with feeling. Sounds good, feels good.