26. Carly Rae Jepsen
After being anointed by the Powers That Bieber as the next big (Canadian) thing, pop newcomer Jepsen scored the official hit of summer 2012 with the now-ubiquitous "Call Me Maybe." A second single (a duet with Owl City called "Good Time") was released in late June.—Jeff Royer
(Photo: Stuart Wilson, Getty Images)
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