Speaking to Company magazine, the 30-year-old Strictly Come Dancing winner said that she would "rather put on weight" as she prefers the way she looks with more curves.
"I always want to put on weight and I am still trying to get that Jennifer Lopez bum," she told the women's lifestyle publication.
"For me, the ambition in my life isn't to achieve a washboard stomach, as long as I'm healthy, exercising and eating fruit and veg, I'm not going to deprive myself of chocolate."
Taking a realistic view of most women's struggle with body image, Alesha admitted that she has her good days and bad days.
The sultry songstress recently showed off her voluptuous physique in her latest music video for chart hit single Breathe Slow.