The 2013 Teen Choice Awards air this Sunday night on FOX, so to get you amped for the big event, we decided to take a trip down red carpet memory lane. We dug up photos of your favorite celebrities' — from Selena Gomez and Justin Bieber to Cody Simpson — first time at the show. It's insane to see how much some of these stars have changed and how their style has evolved.
Click through the above slideshow to see the throwback pics, and then tell us in the comments who has changed the most! Our vote goes to Miley Cyrus!