January 11, 2012 - Dave Hogan/Getty Images Europe more pics like this »
Jessie J

While Jessie J scored moderate success on the U.S. charts with her 2011 single "Domino," most Americans aren't familiar with the London native, who has probably been mistaken for Katy Perry more than a few times. Her debut album Who You Are has sold over a million copies in the UK, and over 2.5 million worldwide.