Experts fear the star has an eating disorder New York - Arabstoday Miley Cyrus left Windsor Pilates in West Hollywood showing her protruding ribcage in a belly-bearing crop top. The super slim 19-year-old displayed jutting collar bones and a minuscule waist in her black sweatpants and white striped top. With her hair pulled back into a high bun, her rail thin look was further accentuated. Miley\'s tiny frame is the result of a strict exercise regime, and she is regularly seen attending Pilates classes as often as twice a day. An hour of Pilates is said to burn about 360 calories, enhance a person\'s core strength, and increase flexibility. Meanwhile, experts worry that Miley’s obsession with food could signify a deeper, underlying issue, but she keep saying that she isn’t anorexic or suffering from any eating disorder.