Justin Bieber has grown up so much over the years. One day he was a baby-faced singer and now he’s one of music’s sexiest hunks. HollywoodLife.com is compiling Justin’s hottest photos in honor of his huge birthday milestone!
Let’s start with the sexiest moment of Justin’s year: His Calvin Klein ads. The singer posed shirtless and in just his underwear. Yep, that means his ripped abs and chiseled arms were on display for all to see.