Erin Wasson's Instagram pic - protruding ribs Credit: Courtesy Erin Wasson

Model and actress Erin Wasson has sparked concerns for health after posting a near-naked picture online, displaying her extremely protruding ribs.

The Abraham Lincoln: Vampire Hunter actress posted the topless snap on her Instagram account on Sunday, May 12, with the caption "Live a little."

But while the picture has received almost 5,000 likes from fans, it has also gotten a large number of shocked comments from those worried for the model's well-being.

"She's a skeleton" one shocked viewer commented, while another urged the Vogue cover-star to "eat a little"

The 32-year-old model has spoken in the past about being bullied when she was younger for being too thin.

"I remember I was tormented for being flat-chested and really skinny," she once told Sydney's Daily Telegraph. "I think, more than anything at this point in my career, my responsibility is to stay strong—mind, body and soul.

"I've always been an athletic person," she continued. "I’ve been blessed with good genes from my mum and dad and I’m going to ride that genetic wave for as long as I can."