By Debbie Emery - Radar Reporter
As Lindsay Lohan spent yet another week flaking on work obligations, frolicking on the beach and appearing in court, her little sister Ali has sparked concern again by losing even more weight, and RadarOnline.com has photos of her downward spiral.
The teenage model appeared to be literally wasting away when she attended the Jay-Z concert at the Staples Center in Los Angeles with the troubled Mean Girls star on Tuesday night, and experts worry that she is putting her health at serious risk.
"She looks like a death camp survivor," nutritionist Majid Ali (who has not treated the star) told RadarOnline.com in an exclusive interview.
"It appears as if she is wasting away as her body chews up muscle looking for fuel."
At 5'8 1/2", Majid thinks that Ali is severely malnourished and estimates her weight to be 90 lbs at the most.
"It seems more like a starvation diet than binging and purging," he explained.
The younger Lohan turns 18 on December 22, but her gaunt face, sunken cheeks and ashy complexion make her look much older than her years.
"Malnutrition will prematurely age her," the nutritionist revealed. "It tears down tissue collagen and leads to wrinkles, poor skin, limp hair and bad nail quality."
As RadarOnline.com previously reported, the sisters hit the beach in Hawaii last week to attend the Pipeline Masters surfing competition, and while Lindsay showed off her ample curves in a bikini, Ali's baggy shorts barely clung to her bony hips.