NEW YORK, NY - FEBRUARY 08: Model Christie Brinkley walks on the runway wearing a Pamella Roland design at The Heart Truth's Red Dress Collection 2012 Fashion Show at Hammerstein Ballroom on February 8, 2012 in New York City

Some divorces NEVER end well…CHRISTIE BRINKLEY at war with cheating ex PETER COOK again over child support.

 Cook, who admitted he had an affair with an 18 year-old hottie while married to the Uptown Girl, has filed a 91-page court document packed with damning insults and petty complaints to counter Christie’s claim that he owes her child support.

The affidavit, filed in Suffolk County Supreme Court, reveals that Christie wants more than $32,000 to reimburse her for expenses for their two kids — including school tuition and summer camp fees.

But Cook insists it is Brinkley who should pay him.

His detailed 91 page response to Christie’s request is chock full of vindictive nastiness. He claims she’s a "narcissistic egomaniac" and even kvetches about iPhone family plans.

Cook also says he took care of the kids while Christie toured with the musical “Chicago” and that she should pay him, sources told The New York Post.