The Liberty X singer, who recently had baby Faith's name tattooed on her wrist, revealed her body before, during and after pregnancy on the microblogging site, following months of dedicated workout sessions and healthy eating.
Both Heaton and husband Hugh Hanley are qualified personal trainers, although the former Celebrity Big Brother star had to wait two months before she could begin working out as daughter Faith arrived via caesarean section and doctors recommended the delay due to her arrhythmia.
Tweeting alongside the picture, Heaton said: "Check pic guys-thought it would fall off after going birth-I was wrong-it's been a long 5 months! But I'm back! Whoop."
Following criticism by one Twitter user concerning Heaton using too much childcare so she could hit the gym, Heaton clarified: "I worked out in my loving (sic) room while my baby was in the bouncer! Never ever had help with my child! I work out at home or gym in weekend when husband at home!
"It is hard but once u start seeing results it keeps you going.
"I train during the week in living room dancing around .. Like an idiot lol, Weekends at gym when Hugh home."