Wasting Away! Gigi Hadid's Shockingly Thin Frame Has Everyone 'Worried Sick' — Is She OK?

Gigi Hadid is one of the biggest supermodels in the world right now, and it looks like that stress is taking a toll on her! And with New York Fashion Week approaching, she isn't slowing down anytime soon.

"Gigi's totally stressed-out and exhausted," a friend told Now magazine. "She's gone down another dress size to a 00."

The insider added that the 21-year-old is "lucky if she gets 500 calories a day inside her right now."

Besides being one of the biggest models at the moment, her family struggles are also taking a toll on her! Both her mother, Yolanda Hadid, and sister, Bella Hadid, are battling Lyme's disease and it "kills her that she can't do anything to help."

Recently, Gigi confronted a follower on Instagram after the person commented on her weight loss. She explained it as "growing up" and admitted to losing "baby fat."

The source added, "everyone's worried sick about her." What do you think of Gigi's weight loss? Let us know your thoughts in the comments section!