Can you lose weight in just four weeks with no diet, exercise or surgery? That's what skin care expert Janet Harris says she can do for you with the Vela Shape machine, which claims to reduce cellulite and help shed stubborn fat with suction, infrared light, and radio frequency. Rachael, who's skeptical of the idea, sends a viewer to try it out.

Karen, an aerobics instructor who's been trying to slim down since giving birth, tries four sessions with Janet at roughly $500 a pop. "I'm smaller then I was before I had the baby," gushes Karen who lost 8 pounds and 2 inches from her waist.

Still, Rachael asks Janet, "You really believe this thing absolutely works?"

"I was amazed," says Janet, who explains the procedure is best for people who are close to their goal weight. She adds, "If you do your homework and take care of yourself, it's going to last forever because we're actually metabolizing that fat and getting rid of it," Janet says. "Essentially you can treat any area of the body where you have that fat that's resistant to weight loss ... it's the only FDA approved treatment to reduce the fat in the thighs."