(HMG Celebrity News) – After recently denying engagement rumors originating from People Magazine, “I Am Number Four” co-stars Dianna Agron and Alex Pettyfer have reportedly called it quits.  A source confirmed to US Weekly the Glee actress broke things off and Dianna is moving out of the Los Angeles home they share.  Agron, who plays cheerleader Quinn Fabray on the FOX TV hit, began dating the English actor a year ago after their I Am Number Four director set them up.  A source tells TMZ the Agron was upset over a semi erotic Tyler Shields photo shoot involving Pettyfer, Lydia Hearst and

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