Jennie Garth recently revealed that she was diagnosed with a leaky heart valve seven years ago. "It's a common thing," the 90210 star tells Access Hollywood. "A lot of people have it, and they don't know they have it. It's the main artery that goes to your heart. It sort of flutters open and shut and leaks blood," says Jennie, who admits that sometimes she can feel her heart fluttering, but doesn't consider it a problem right now. "Down the road, it's something that could get more complicated or it could not. People have had valve replacements and that kind of thing," she adds.