Lindsay Lohan's younger sister, who recently signed a modeling contract, looked emaciated with sunken cheeks and skinny arms and legs while out in Beverly Hills, leading to concerns about her health.

"She is very underweight. By looking at her cheekbones you can tell she has muscle wasting going on," Dr. Majid Ali, who has not treated Ali Lohan, exclusively told RadarOnline.com when he saw the shocking pictures of the teen.

"I'm unsure how she is losing weight but she has the look of someone who may binge and purge plus calorie restrict," he said Dr. Ali, Editor, The Journal of Integrative Medicine; Formerly, Associate Professor of Pathology, College of Physicians and Surgeons of Columbia University, NY.

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