A morbidly obese primary school teacher has been able to wear a bikini for the first time in her LIFE after losing a whopping 13 stone, and having 10lb of excess skin removed.

Canadian Mallory Buettner underwent a gastric bypass two years ago, after she ballooned to 28½ stone, and has since lost more than half her body weight.

The 29-year-old completed her stunning transformation on June 30 this year – with a tummy tuck and brachioplasty on her stomach and arms.

The desperate dieter had never worn a bikini before, even in the hot tub in her garden, but says she now wears one every day after hitting 13st.

But the super slim-down has come at a price for Mallory, who had to call off her wedding to her ex-fiancé as he struggled to cope with her new life.

The brave brunette from Quinte West, in Ontario, is now opening up about her ‘life after going under the knife’, which included tricky surgery complications.

Mallory said: “I had never worn a bikini in my life, and I had a dreaded put on a bathing suit even in my own hot tub in the back yard.

“I live in a bikini now. I wear one every day, I am a bikini bum. After the surgery, I went out and bought five.”

Mallory was 9lbs when she was born, and her weight has been an issue her entire life.

She had hit 14st3 by the time she was 10 years old, and had ballooned to 20st5 by the time she was 18.

Mallory graduated at the age of 20, when she tipped the scales at 26st3.

She said: “I was always bigger. I have an older sister and we have always eaten similar foods but she was always a normal size.

“At school I was the biggest kid in the class. I was eight years old the first time I went on a diet.

“I liked to eat chips, pizza and pop. Then at I high school I drank a lot of ice coffees and ate McDonalds.”

When nothing else worked, Mallory started the pricey Doctor Bernstein Diet – which costs £460-a-month.

She lost 5st10 by eating between 500 and 800 calories a day, but could no longer afford the plan when she bought a house.

When Mallory went back to eating 1,500 calories-a-day, her metabolism struggled to cope and she piled on the pounds.

She said: “I had a meltdown in my doctor’s office and that was when they recommended surgery.

“I hated the idea at first. It seemed like the easy way out.

“I was so upset and I rang my sister crying. She was so supportive and told me to go for it.

“She knew I had always eaten well and tried to be active but nothing was working. In the end, I had to swallow my pride.”

After years of failed diets, Mallory booked her surgery for May 2014.

However, in a twist of fate, the newly engaged young-woman was forced to choose between her health and her husband-to-be.

Mallory said: “The surgery was scheduled for two months before the wedding.

“He wasn’t supportive and liked things the way they were. I think he thought I wouldn’t love him after I lost weight.

“We called off the wedding days before the date and never spoke again.

“It was the hardest thing but I had to choose to be happy. We both moved on and I hope he is happy.”