Photo by Jason Carter Rinaldi/Getty Images

It was a big first week for Australia's 5 Seconds of Summer.

The group's self-titled album on Capitol Records has debuted at No. 1 on the Billboard 200 with 258,643 copies sold in its first week.

This long-awaited release is the biggest debut by an Australian artist ever in the Soundscan era – and actually beats their own She Looks So Perfect EP, which sold 143,000 copies when it released in April. This release also becomes the biggest new artist debut of 2014.  

The success follows hit singles such as "She Looks So Perfect," "Don't Stop" and "Amnesia," and guitarist Michael Clifford tells us that he and his bandmates have been stoked by the way U.S. audiences have embraced them during the past year:

"It's amazing. We can't, I always thought when we started, I just assumed that the U.S. was out of reach, and it's nice to know that... When you start a band you kind of just do it for fun, and, yeah, you can never expect stuff that's gonna happen. So when it does happen, it's just amazing."

Having already reached No.1 globally on iTunes in 76 countries, this full-length has sold more than 1.5 million units worldwide, while total single track sales in the U.S. have surpassed two million.

5 Seconds of Summer is getting ready to hit the road with good pals One Direction starting August 1 in Toronto before moving on to stadiums and also the iTunes Festival on September 4 in London.

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