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Justin Bieber
Far from his humble days on YouTube, Justin Bieber has now become a teen icon. His first single, "One Time", was released in 2009 and was followed by his debut album, My World. My World 2.0, released in March 2010, featured the smash hits "Baby" and "Somebody to Love". He released Believe in 2012, which included the single "Boyfriend".
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Taylor Swift
Named by Time Magazine as one of the most 100 most influential people in the world, Taylor Swift has won the hearts of millions of fans all over the world. Red, her latest album, released in 2012, features a slew of hits, including "We Are Never Ever Getting Back Together", "I Knew You Were Trouble", and "22".
R5
Siblings Riker, Rydel, Rocky and Ross Lynch, along with best friend Ratliff, had a big year. They released a 4-song EP, which included the hit single "Loud".
Selena Gomez
Selena's meteoric success began with her lead role in "The Wizards of Waverly Place" and as the front woman for Selena Gomez & the Scene. In 2013, Selena released her first solo album, 'Stars Dance", which included the hit singles "Come and Get It" and "Slow Down".
Demi Lovato
Demi's fourth studio album, Demi, was released in 2013 and features the singles "Heart Attack" and "Made in the USA".