Kelly Bensimon: 'Real Housewives of New York' were cast mates, not friends

On Saturday (Dec. 10), celebs turned out for the annual Z100 Jingle Ball Concert at New York's Madison Square Garden. Donald Trump, Abigail Breslin and Khloe Kardashian were on hand -- along with 17,500 other revelers -- to see performances by Lady Gaga,

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