Last night in Irvine, California, 5 Seconds Of Summer fans got a huge treat as the band brought the Madden Brothers, Benji and Joel, on stage to cover an old Good Charlotte favorite, “Girls & Boys,” from their 2002 release, The Young And The Hopeless. This isn't all that surprising given that the Madden Brothers both live in the Los Angeles area and have a history with 5 Seconds Of Summer—most notably with having a huge hand in writing “Amnesia,” one of 5SOS' biggest hits. Even so, fans were understandably ecstatic when Benji and Joel joined Luke Hemmings and the gang to ressurect an old hit.

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You can watch fan-shot footage of the performance below. Let us know what you think.