Ali Lohan -- Too Skinny?

Ali Lohan has clearly lost weight, but has she lost too much?

From Fox 411: "Lindsay may not be the only Lohan sister with serious issues. Model little sis Ali, who signed a contract with Next Model management last year, is looking dangerously skinny, with experts estimating she weighs less than 100 lbs., and saying she may be on a serious starvation diet. Friends close to Lohan tell Fox411.com they are starting to get worried about the drastic weight loss, and about Ali's health."