Opening up: Mark Billingham - pictured middle A man who worked as a bodyguard for Brad Pitt and Angelina Jolie for a year-and-a-half opens up about the estranged couple's fear their kids would be kidnapped and held for ransom, and much more, in an insightful new interview. Mark Billingham, a decorated ex-member of the British Army, spoke with The Sun on some of the the eyebrow-raising anecdotes he picked up in nearly 18 months as head of security for the Mr. & Mrs. Smith stars and their six kids. Among them include the painstaking measures they took to ensure their brood was safe, and the numerous run-ins with stalkers of the former king and queen of the A-list. 'The biggest concern for them was the kidnapping of the kids, it’s all about money,' Billingham told the paper of the couple's laser-focus on protecting the six children - Maddox, 15, Pax, 12, Zahara, 11, Shiloh, 10, and twins Vivienne and Knox, eight. Billingham said that the Pitt, 52, and Jolie, 41, ...