Listen to 5 Seconds of Summer Radio on iHeartRadio

5 Seconds of Summer heated things up in New York City Monday night with an exclusive live performance at the iHeartRadio Theater to celebrate their self-titled debut album.

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The Australian teenage heartthrobs performed songs from the new album including fan fave "She Looks So Perfect" and new single "Amnesia." The performance and Q&A was video live-streamed on all Clear Channel CHR station sites and, resulting in a #1 worldwide trending topic on Twitter: #iHeart5SOS.

Check out videos from the iHeartRadio Live performance below, share with your friends and let us know what you think by tweeting with hashtag #iHeart5SOS!

5 Seconds of Summer Performs "Don't Stop"

5 Seconds of Summer Performs "Amnesia"

5 Seconds of Summer Performs "She Looks So Perfect"

Before they took the stage for the iHeartRadio Live show Monday night, we had 5SOS fans tweet dares for the guys. We got some great responses, and it turned into a backstage game of 'Tweet & Dare'! Check out the video below.

PHOTOS: 5 Seconds of Summer Live