The former Liberty X star has slimmed down from a size 12 to a size 8 in the past 12 months after reportedly banning junk food from her house and opting for a healthier diet.
Speaking to Take 5 magazine, Heaton explained: "When I saw old pictures of myself, I hated them. I've never been skinny like most girls in this industry and I've been scrutinised because of it. I decided to make a change."
The star added that she was disappointed when she later heard speculation that she was relying on secret liposuction sessions.
She said: "When I heard about that, I was horrified. I just couldn't believe people would say that. Then my friend told me to take it as a compliment. If people think I've had surgery, then I must look pretty good."
Heaton announced earlier this month that she is engaged to marry partner Hugh Hanley.