Brad Pitt Risks Custody Battle Over Wild Partying

Brad Pitt was the last man standing at a boozy music festival — putting both his sobriety and the custody of his kids in jeopardy!

That is the finding of a National ENQUIRER investigation that tracked the reeling single dad to the Rabbit Hole nightclub — where he whooped it up until 3 a.m. following England’s annual Glastonbury Festival. What’s more, multiple spy-witnesses claimed 53-year-old Brad cozied up to actress Sienna Miller as the sun rose!

“Brad’s behavior is raising major alarm bells,” an insider told The ENQUIRER. “Even if he did stay sober in Glastonbury, most of the people he was partying with were drunk, and booze was flowing nonstop. “If he’s back drinking, he’s ruining all the hard work he put in to getting clean, and gaining custody of the kids. And for what? One weekend of partying? That’s nuts!”

  After Angelina Jolie blindsided him with divorce papers, Brad quit drinking and attended Alcoholics Anonymous meetings, as first revealed by The ENQUIRER. He’s also provided the court with voluntary drug tests to prove he’s on the wagon as he fights to spend more time with his six children.

A source close to the “Fury” star told The ENQUIRER he avoided alcohol at Glastonbury, and insisted Brad’s relationship with blond stunner Sienna is platonic. But an insider spilled: “At this rate, Brad’s heading for a major relapse, and he’s only going to push Angie’s buttons if she thinks Brad’s flirting with Sienna. “Right now Angie holds all the aces in terms of custody, so Brad needs to keep on her good side.”

The ENQUIRER’s mole added: “Brad needs to calm down, go back to his sober life and get away from this type of temptation — that is, if he wants to persuade Angie that he can be trusted around the kids!”