Summer's Breakout Stars?

Summers Breakout Stars Title Card

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This time last year, Chris Hemsworth and Octavia Spencer were relative unknowns. But, by Labor Day 2011, both had solidified themselves as bona fide movie stars thanks to the successes of “Thor” and “The Help.” Who has the potential to breakout this summer? Take a peek at the contenders ... -- By Matt Whitfield, Yahoo! Staff

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