3. Carly Rae Jepsen
Everyone knows Carly Rae Jepsen as the girl who finished third on the 2007 series of Canadian Idol, dont they? Well I had no idea about that up until recently, but its true. She lost out to eventual winner, Brian Melo, who went on to have minor success in his native country. Carly released her debut album in 2008, and it failed to make any kind of an impact. Then came the lead single, Call Me Maybe, from her second album, Kiss, and suddenly the whole world knows who she is. The ridiculously catchy track was the best-selling digital single of 2012, with digital sales of 12.5 million worldwide. It went to number 1 in 19 different countries worldwide, and was a top 5 hit in many more.