Price, 30, who is a mother of three, claimed that it is because of her genetic make-up that she stays slim on junk food.
"I've got this reverse metabolism," the Daily Express quoted Price as having told New! magazine.
"When I was in the jungle [on I'm A Celebrity... Get Me Out Of Here!] I was the only one who put half a stone on.
"The more junk I eat the more my metabolism goes up. If I live on salads and fish, my belly gets bloated and I put on weight," she added.