Australian pop-punk outfit 5 Seconds Of Summer are gearing up for their performance for the 'Good Morning America' summer concert series and surprised some superfans in anticipation of the main event. 

The boys are set to perform at Central Park’s Rumsey Playfield on Friday, August 21 and fans can attend the show for free, but tickets have to be obtained from the event's website beforehand. 

In this adorable segment for 'Good Morning America', the 'She's Kinda Hot' heartthrobs told the camera: "We just pulled a few fans from the queue... these three girls think they're going to get interviewed for GMA, but we have something in store for them! I hope their reactions are good otherwise it makes for bad TV!"

The lads then crept up behind their fans, who were having their photos taken at the time, and gave them a fantastic and unexpected surprise. 

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