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    Jennifer Lopez, Enrique Iglesias argue about marriage

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    When two mega superstars tour together, not only does it involve  twice the dancers, technical effects, riders, and entourages -- but it also involved also twice the egos. So we're not surprised that between Jennifer Lopez and Enrique Iglesias, currently co-headlining a tour that kicked off in Montreal last week, they're butting heads on a very sensitive subject - marriage.

    Lopez, who has been married three times, has tried to convince Iglesias that he should marry his girlfriend of 11 years, tennis player Anna Kournikova. While both were guests on "Good Morning America," Iglesias said he doesn't see the need for ceremonies and documents when a relationship is fine without them.

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    "I think Jennifer and I think differently when it comes down to that. I don't think you need to be married to someone -- that doesn't mean that you are going to love them more, that doesn't mean you're going to be any more loyal. I mean, at the end of the day, when you're with someone, you are married," he said.

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    In response, Lopez said, "We had this discussion over dinner and it's a long discussion."

    Even without watching the interview we can tell the tension was higher than J.Lo's shoe budget.

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    Lopez split from her ex-husband Marc Anthony almost exactly one year ago, with whom she has twins Max and Emme. However, the 42-year-old still says she wants to marry again.

    "For me, the biggest dream is the fairy tale ... I will never give up on that dream," said Lopez, who is currently dating backup dancer Casper Smart, 25.

    For Iglesias, though, we bet the key words there are "dream" and "fairytale."