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 ...

PARENTS
Klaus: Son of an exercise-equipment mogul and horse breeder
Mezvinsky: Son of former Pennsylvania Rep. Marjorie Margolies-Mezvinsky and former Iowa Rep. Ed Mezvinsky, who is now serving a 7-year sentence in federal prison for "getting caught up in a series of Nigerian e-mail scams."

EDUCATION:
Klaus: Andover/Washington University/Oxford/Harvard
Mezvinsky: Stanford, Oxford

CURRENT EMPLOYMENT:
Klaus: Harvard Ph.D. candidate
Mezvinsky: Goldman Sachs investment banker

MET CHELSEA...:
Klaus: At Oxford, where he was a Rhodes Scholar
Mezvinsky: As childhood friends; later attended Stanford together

PUBLICLY OUTED..."
Klaus: Checking into a hotel in Venice with Chelsea as "Mr. and Mrs. Smith" in 2002
Mezvinsky: At the opening of Tao in Vegas

PRESS APPRAISAL:
Klaus: "Ebullient ... looks better [than Bill]"
Mezvinsky: "Goofy and laid-back ... good for Chelsea"

FUN FACT:
Klaus: Book agent is Andrew "The Jackal" Wylie
Mezvinsky: Dad is set to be released from jail in November '08 ... just in time for the election!