Today is a memorable day for 5 Seconds of Summer: it's the band's four year anniversary! We can't believe it's been that long since Luke Hemmings, Ashton Irwin, Calum Hood and Michael Clifford joined forces and together formed one of the best band's out there right now. The guys have really come into their own and have transformed into total rock stars, especially when it comes to their personal styles. They've come so far and looking back on how much they've grown up over the last few years is going to bring on all the feels. Trust us!
In honor of the band's big day, we decided to round up some photos documenting just how much the guys' style has changed. From their first group selfies to their rise as confident red carpet stars, we've got it all covered! Click through the gallery to see the photos and then tell us in the comment what your fave throwback 5SOS moment is!