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63. Justin Bieber

What didn't Justin Bieber do in the last year? The 18-year-old music mogul toured the word, teased singles from his new album, mentored up-and-coming superstar Carly Rae Jepsen, and somehow managed to find time to romance his girlfriend, Selena Gomez. The duo are obviously in love, and showed their PDA all over, including at the beach, during the shoot for his "Boyfriend" video, courtside at a Lakers game, and even at Jamba Juice! Justin's got lots of love to share, and is too cute with his little siblings, Jazmyn and Jaxon. Justin also proved his adult status by getting a big tattoo of Jesus on his leg.

Last Fall, Justin released a holiday album Under the Mistletoe, which debuted at No. 1. Much of the Spring was dedicated to promoting June's Believe, which features collaborations with some of the world's most popular artists, from Drake and Nicki Minaj to Ludacris. Justin needed to find new space to store all the awards he won. He cleaned up at shows including the MuchMusic Video Awards, Billboard Awards, Teen Choice Awards, Kids' Choice Awards, and the MTV Europe Music Awards. There was one big problem Justin had to deal with — a fan accused him of fathering her child, but they seem to have settled the matter.

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