By Breaking Celebrity News Staff

She's come under fire for her recent weight loss but Ali Lohan refused to cover up her skinny frame as she stepped out in short shorts and a T-shirt.

Breaking Celebrity News has the scary new photos of Lindsay Lohan's rapidly disappearing little sister as she ran errands in Malibu Tuesday in her older sibling's Porsche.

With her lean legs on display and sporting her new bobbed haircut the 5'8" aspiring model appeared a shadow of her former self.

The 18-year-old has sparked a weight debate over her startling look with experts telling Breaking Celebrity News they fear she has an eating disorder.

"She looks terrible and it definitely seems like there is an eating disorder or super serious dieting going on, which she clearly doesn't need," said Hamptons Diet creator Dr. Fred Pascatore. "It is frightening."

Ali has been looking increasingly gaunt since last August when she signed a modeling contract with NEXT Model Management.