When We Were Young Festival brought us an incredible amount of collabs and onstage antics, and 5 Seconds of Summer’s set was no different as they brought out Good Charlotte’s Joel Madden.

5 Seconds of Summer were working their way through an enthralling set, which opened with their 2014 breakout hit, ‘She Looks So Perfect’. 

5SOS would then bring out the Good Charlotte frontman around midway through their set for a rendition of ‘Amnesia’, their huge track from their self-titled 2014 album.

Other bangers in their set included ‘If Walls Could Talk’, ‘She’s Kinda Hot’ and of course their mega hit ‘Youngblood’. 

Have a watch of the special moment they brought Madden onto the stage via the video below.