Although Ashton Irwin's been known to try and give the #5SOSFam some SERIOUS heart palpitations...

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#4YearsOf5SOS! Our 29 FAVE Instagram Snaps Of The 5 Seconds Of Summer Boys!

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See the full gallery: #4YearsOf5SOS! Our 29 FAVE Instagram Snaps Of The 5 Seconds Of Summer Boys!