Lindsay Lohan's New Role: Leading Trend of Too-Thin Celebs

April 27, 2009 — -- Lindsay Lohan says she wants to get back to work, focus on her career and prove to her critics that she can play the part of a serious actress.

But following her breakup with DJ Samantha Ronson, all she's proved is her ability to shed pounds.

Lohan, 22, flashed a shocking amount of skin and bone while shopping in Los Angeles last week, wearing a halter-cut dress that highlighted the caverns of her shrinking frame. People magazine reported Friday that Lohan's friends and family see her weight loss as a cry for help.

It's probably not the role she was going for, but Lohan's current appearance makes her the poster child for frail figures in the news.

She wasn't always so skinny -- Lohan appeared healthy, happy and at home with her curves in her breakout role in 2004's "Mean Girls."

But she seemed markedly thinner at the time of her 2007 DUI arrest, and her weight appeared even lower last fall.

Lohan joins Australia's Miss Universe contestant Stephanie Naumoska, 19, as one of the latest people in the public eye to provoke concern because of her scary-skinny frame. Naumoska reportedly has a body mass index of 15.1, far below the healthy benchmark of 18.5.

And then there's another cast of characters cyclically making headlines because of their bony bodies, among them, Mischa Barton, Kate Bosworth, Angelina Jolie and Katie Holmes. The fashion industry can crow about curvy figures making a comeback, but in a world where Kate Moss sparks pregnancy rumors because she packs on a pound or two, the waif aesthetic still has its adherents.

ABCNews.com asked members of the medical community to weigh in on the appearance of Lohan, Naumoska and Holmes. The verdict: their too-thin frames are damaging for them and for the people who see their photos and think such figures are normal.

Madelyn H. Fernstrom, director of the University of Pittsburgh Medical Center's Weight Management Center: "Linsday Lohan has grown up before the camera. We have so many visuals of her, and she yo-yos from underweight to the lower-end of healthy. To me, it seems a range of about 20 pounds -- she's at the low end now. So, compared to other photos of her, she looks underweight to me, and is definitely thinner than she has been in recent months and years."