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Single Ladies of 2011

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February 26, 2011 - Pascal Le Segretain/Getty Images North America more pics like this »
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20. Dianna Agron

One week you're supposedly getting married, the next you're breaking up. That's the Hollywood way -- just ask Dianna Agron! She and I Am Number Four co-star Alex Pettyfer broke up midway through promoting the new flick in mid-February, just days after engagement buzz surfaced. Whoops! The two dated for less than a year and apparently Dianna was the one who moved out of the home they shared.