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Mark Billingham worked as a bodyguard for Brad Pitt and Angelina Jolie for 18 months, and now he’s ready to talk about life inside their inner circle.

Billingham spent 27 years in the SAS and served in Iraq before winning the Queen’s Commendation for Bravery after he captured an IRA sniper by using himself as bait. The guy’s hardcore. But working for Brangelina was one of his hardest tasks.

“I was Brad and Angelina’s head of security. The military set me up perfectly for what I did with them. The biggest concern for them was the kidnapping of the kids; it’s all about money,” Billingham told Page Six.

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He reportedly grew very close with the couple’s six children — Maddox, Pax, Zahara, Shiloh, Knox and Vivienne — and claims to be one of the few staff members the couple trusted with the kids.

“Angie and Brad are very worried about who goes near their children. It was clear from the start we had a great chemistry, and they trusted me with the kids. We got very close, I was living with them all the time. I could take the kids anywhere I wanted to on my own,” he continued. “No one else was allowed to do that. Even when I wanted to bring in extra people, they wouldn’t let any of those near the kids. They could look out for them from a distance, but they couldn’t physically touch them. I took them swimming. I fathered them, basically.”

Billingham also revealed that for celebrities of Jolie and Pitt’s caliber, stalking is often a big problem. He recalled one scary incident that involved Jolie.

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“We had stalkers in Chicago and New York which I had to deal with. Angie was filming in a crowd and everyone’s got smiles on their faces except for one guy. He looked angry. A few days later we were coming off set and this guy came running down the road with photos to be signed. Angie wanted to get out of the vehicle and do it but I said no. I went and got the photos and took them to her. She was like, ‘Wow, these are personal photos.’ The guy ran off then reappeared days later near the hotel, so I got him arrested,” he explained.

“He’d been following Angie all over the States. To me, it was a John Lennon classic,” he said. “Whenever she was on her own in pictures, he was smiling. Then whenever she was with Brad, he had this angry look on his face.”

Pretty scary stuff!

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