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How Well Do the 5 Seconds of Summer Boys Know Each Other? ET Puts Them to the Test

They might be the hottest Aussies on the scene right now -- and 5 Seconds of Summer is on Entertainment Tonight!

In honor of the pop band's debut album hitting U.S. shelves, ET caught up with Michael Clifford, Calum Hood, Ashton Irwin and Luke Hemmings at the iHeartRadio Theater in New York to talk crazy fan encounters, their love of One Direction and to find out just how well these guys know each other. Who spends the most time on his hair? Who is the group's resident gym rat? Find out in the video above.

WATCH: 5 Seconds of Summer Remember Their Big Break

If you haven't heard of these guys yet, here’s what you need to know: They were discovered by One Direction's Louis Tomlinson after gaining a bit of YouTube fame and quickly headed out on tour with the UK boy band. They signed a record deal with Capitol Records and their debut album is out now. You may recognize their global smash "She Looks So Perfect," which hit No. 1 in 39 countries but peaked at No. 2 on the Billboard Hot 100 in the U.S. They performed at the Billboard Music Awards earlier this summer (with Kendall and Kylie Jenner famously flubbing their introduction) and are set to hit the MTV Video Music Awards stage next month.

The boys are already a worldwide phenom with fans, boasting more than 5.7 million likes on Facebook and 3.79 million active Twitter followers.

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Fans can catch 5 Seconds of Summer on tour in the U.S. with One Direction beginning August 4.

Don’t miss 5 Seconds of Summer on ET! Tune in Tuesday, July 22 for more from our interview.

Follow Sophie on Twitter: @SophieSchillaci

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