BIZARRE LOVE TRIANGLE Klaus, Mezvinsky, Clinton (inset)

Fop-headed Ian Klaus may no longer be Chelsea Clinton's romantic interest, but if his book party Thursday at Manhattan eatery Tabla is any indication, he's handled the rather difficult maneuver of remaining tight with the ex's family with aplomb. Not only did Chelsea's dad Bill serve as host, but the former First Daughter (and perhaps future First Daughter) even brought her current boyfriend, banker Marc Mezvinsky.

Which got Radar to wondering: Just how do Klaus and Mezvinsky stack up?

After the jump, the tale of the tape ...

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