Fact: Calvin Harris, DJ, producer, Scot, and ex-boyfriend of Taylor Swift, is hot. Like, super hot. He's posted a reminder of this truth to Instagram, in the form of a shirtless Armani undie ad. ¡Ay, caramba! (Okay, that's Spanish, not Scottish, but you guys, seriously, those abs!) But Mr. Harris wasn't always the blonde, 33-year-old dreamboat we know and drool over today...Even Cal had an awkward phase (stars, they're just like us!), which, frankly, makes us love him even more. Here's an investigation into when and how Calvin Harris got so sexy.