The Malibu's Most Wanted star, who briefly dated Jennifer Love Hewitt, reveals he was diagnosed with the condition at 10-years-old and was fitted with a pacemaker at 14. The 45-year-old's revelation shocked the medical professionals on U.S. TV show The Doctors.

"I had no idea," Dr. Kathy Magliato replied. "You can't even see it."

"You thought I had breast implants," Kennedy joked.

Ironically, Jamie is currently starring in Heartbeat, a TV drama based on top cardio thoracic surgeon Magliato's life.

"She's a legend," he continued. "I always tell people I learn more on this show than I did in school. I do! Each week we have a case that's based on something really bananas."