It feels like yesterday when Justin Bieber dropped his breakout hit “One Time,” and took the world by storm at just 15 years old. But, alas, it has been 15 trips around the sun since that fateful day, during which the pop icon has released eight no. 1 hits, won two Grammy awards, and launched clothing line “Drew House,” among many other achievements. Yesterday, he turned the big three-oh—and Hailey Bieber commemorated the milestone with the sweetest, PDA-filled Instagram tribute.