Gigi Hadid has been looking smoking hot recently. Her recent turn on the Victoria's Secret catwalk showed off her chiselled abs, taut tummy and perky bottom, all the results of her intensive exercise regime and diet ahead of the Paris catwalk spectacle. But there's also another sad reason behind the transformation in Gigi's figure recently - Hashimoto's Disease.
The model revealed at a recent Reebok event that she has been diagnosed with the condition - a type of autoimmune disorder - which sees the immune system attack the thyroid. The medication she is taking to manage the condition has caused her to lose weight rapidly, something she wasn't looking to do.
"My metabolism actually changed like crazy this year. I have Hashimoto's disease. It's a thyroid disease, and it's now been two years since taking the medication for it," she revealed. "So for the VS show I didn't want to lose any more weight, I just want to have muscles in the right place, and if my butt can get a little perkier, then that's good."
In fact, Gigi's commitment to building muscle in her glutes was so determined, she even took to squating in her apartment at every opportunity.
"I put a sticky note in my kitchen that just said 'squats' and every time I walked passed the squat sticky note I had to do 15 squats. It's a good trick because you have to have integrity with yourself. No one else is watching but you're like, 'Okay, I have to do this for myself,' which is important."
Gigi's younger sibling Bella also recently spoke out about her unintentional weight loss ahead of the Victoria's Secret show, saying: "Weight fluctuates so much. I really didn't mean to [lose weight]. Like I want boobs. I want my ass back. But it's not my fault. My weight fluctuates and so does everybody's and I think that if people are gonna judge, that's the worst you can possibly do because everybody is different."
Both Bella, her brother Anwar and mother Yolanda suffer from Lyme's Disease, a bacterial infection caused by tick bites that leaves sufferers exhausted with muscle and bone aches and mind fogs.