WORLD EXCLUSIVE! BRAD’S FURY AT ANGIE’S SEX MONSTER PARTY PAL

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It’s THE last straw for Angelina Jolie and Brad Pitt!

In a bombshell world exclusive, sources tell The National ENQUIRER that Brad snapped after learning Angie once had partied with a male model who’s now behind bars for a string of sex crimes.

The evil sex offender is Dean Kelly, who partied with Angie when she won the Best Supporting Actress Oscar for “Girl, Interrupted” in 2000, as exclusive photos obtained by The ENQUIRER reveal.

“Brad is humiliated!” a source said. “After he saw photos of his fiancée with Dean, he stormed out of the house just to calm down. He’s embarrassed, upset and sounds ready to bail.”

The disclosure comes after sources said the two had a falling out after Angie nixed Brad filming steamy on-screen love scenes.

“As the father of their six kids, Angie had forbidden Brad from doing any more love scenes with women other than her on camera,” said the source.“But Brad thinks Angie has no right to tell him what to do when she’s still hiding secrets about her past,” said the source.

As The ENQUIRER reported, Brad was also humiliated when we uncovered shocking, never-before-seen video footage of Angie in a dirty, late 1990s drug den.

“This man Dean is upsetting to Brad, especially after he recently flipped out over Angie’s former drug dealer revealing a video of her and spilling some of her sex confessions,” the source said.

The man who filmed the video, Franklin Meyer, claimed Angie bought drugs from him, and bragged about her ex-husband Billy Bob Thornton’s manhood, describing him “as big as a horse!”

“That stung Brad and now he has to contend with the fact that Angie once was fixated on Dean Kelly!” added the insider.

Kelly’s chiseled physique won him a shirtless gig for “Aerosmith’s” music video for “Crazy.”

He was seen partying with Angie, then 25, at Vanity Fair magazine’s post-Academy Awards party in March 2000. “That night I was hanging out with Angie and she was drinking,” said the source. “She was in her crazy phase then,” said the source. “But she was in a great mood because she’d just won the Oscar.”

Kelly’s life took an ugly turn when prosecutors in New Orleans charged him with the rape of a 14-year-old girl in February 2005 and a 17-year-old later that same year. Investigators said they also found a flash drive with child pornography at his home.

Kelly was initially charged with two counts of forcible rape, felony carnal knowledge of a juvenile, possession of child pornography and second-degree kidnapping. In September 2013, he pleaded guilty to lesser charges of sexual battery and felony carnal knowledge of a juvenile for a 10-year suspended sentence and five years probation.

But prosecutors say Kelly subsequently violated probation, and he was locked away in November.

Meanwhile, the source said Kelly displayed signs of deviance back when he partied with Angelina!

“Dean was always on the scene back then,” the insider said. “But he wasn’t like other guys. He wasn’t respectful to women. He was always grabbing, very cocky. I’m not surprised he’s in jail now. But it’s crazy to think he turned into such a monster.”

Ironically, on the night Angie partied with Kelly, Brad was at the same Oscar-night bash with his then-fiancée Jennifer Aniston, said the source.

“For Angelina to be associated with a guy like Dean Kelly is a black mark against her,” added the source. “She’s been a tireless fighter against rape and sexual violence against women worldwide.

“Needless to say, Brad is devastated by all this. It’s the last straw in their relationship!”