This week's songwriter is defining the game as we know it and she's only 23! She's currently still celebrating the release of her debut mini album "Nervous System." The album's first single "Issues," has gone 6x Platinum worldwide! Moreover, she's regularly collaborating with some of pop music's biggest names, having co-written Justin Bieber's smash hit "Sorry," Selena Gomez's "Good For You," and Nick Jonas' "Close feat. Tove Lo". Quite a resume from one of the industry's best and brightest. And The Writer Is...Julia Michaels!