What's Demi Moore's secret to looking so sexy at age 45? Uh, leeches. On last night's Late Show With David Letterman, the Flawless actress revealed how she recently went to Australia for a cleansing. The treatment included leech therapy. Moore said "the highly trained medical leeches" were first placed in her belly button. "You feel [them] bite down on you, and you want to go, 'You bastard!' and then you relax and watch it swell up," she said. "They have a little enzyme that when they are biting down in you, it gets released in your blood and generally you bleed for quite a bit and your health is optimized," she added. "It detoxifies your blood. I'm feeling very detoxified right now." Though she said it first feels "worse then feels better," she plans on "going back, I only got 4 leeches and I feel a bit cheated." Joked Letterman: "Are you sure this isn't just menopause?"