TAKING after her sister Paris, Nicky Hilton is going after an Olsen twin ex. While Paris bagged Stavros Niarchos, a former flame of Mary-Kate, Nicky – who dumped Kevin Connolly last month for cheating on her with a college girl – has quietly been dating Ashley Olsen’s ex, David Katzenberg, son of DreamWorks co-founder Jeffrey Katzenberg. An L.A. spy said,
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