On top of being talented musicians, the men of 5 Seconds of Summer are also very attractive. Case in point, their drummer Ashton Irwin. While the 25-year-old really knows how to get fans going crazy when he's on stage, he also knows how to get our hearts beating a little faster with his hot appearances. Whether he's sporting slicked back pink hair or showing off his curly locks, he always manages to make us swoon. Seriously, his sweet smile could melt even the coldest of hearts. Don't believe us? Take a look at some of his hottest moments over the years.