Canadian teenager Justin Bieber became one of the youngest pop stars in history when he struck it big all over the world in 2009 with the R&B single One Time, aged only 15. He was signed up in 2008 by American manager Scooter Braun after seeing his videos on YouTube. Braun teamed him up with Usher, resulting in the 2009 single One Time, a love song mixing pop, R&B and hip-hop that caught the attention of American radio and ultimately became a major hit in the US, Canada, UK and other parts of Europe. With its themes of teen romance and growing up, Bieber's debut album My World (2010) quickly established him as a major new talent, becoming one of the best-selling albums of the year and selling over a million in the US alone. More hit singles - One Less Lonely Girl, Love Me and Favourite Girl - followed as Bieber hit the road on a massive promotional tour in 2010. He even performed for US President Barack Obama and his wife Michelle at the White House, and won a BRIT in 2011 for Best International Breakthrough Act.