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Billionaire Divorce

$100K a Month in Child Support

10/22/2010 2:53 PM PDT BY TMZ STAFF

Ex-MGM owner Kirk Kerkorian is used to writing big checks, so it may only come with a wince that he has to pay $100,000 a month in child support -- for one kid!

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Kerkorian -- who had one of the nastiest and richest divorces ever from ex-wife Lisa Kerkorian -- has been fighting Lisa's bid to drastically increase support for their 12-year-old daughter.

So who woulda thunk?  Kirk and Lisa settled ... and TMZ has obtained a copy of the agreement, in which Kirk agreed to double the current monthly support, which had previously been set at $50,000.

Child support king Michael Trope managed to squeeze out an additional $10,250,000 in retroactive child support for his client, dating back to 2002.

As part of the deal, Lisa agreed to drop a civil suit she filed against Kirk -- which could have been worth tens of millions of dollars.

And here's the most incredible part -- Kirk may not even be the biological daddy.

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