The 36-year-old mum-of-three and This Morning presenter is admired for her fabulous figure.
However, the successful career woman refuses to be drawn on issues about her weight - because she wants women to decide for themselves what makes them happy.
Holly Willoughby sticks to silence when asked to speak about her diet and exercise - believing there is a conspiracy to encourage low self-esteem in women.
In an article posted to the MailOnline on June 12, Holly said: Im sorry, I just dont want to be a part of this conspiracy to make women feel pressured about their bodies.
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Every woman needs to look in the mirror and instinctively decide what will make her feel happy and good about herself and her body; thats all I did, she added.
Holly Willoughby was promoting her book Truly Happy Baby: It Worked For Me, in the candid interview.
The presenter did reveal that she does not of to gym, but would note any more detail on how she maintains her figure.
She said: I dont want to go on the record saying I did this or that, and then have other women read it and think they have to go and do the same.
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Holly Willoughby and husband Dan dress to the nines as they head to Royal Ascot
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Fans recently showed concern over Hollys figure, after they asked where her curves had gone.
The Instagram picture showed the blonde wearing short shorts and a summery white top.
One user asked: Where have your curves gone? while another continued: You so skinny, were have you gone?(sic)
Gosh you look skinny here, hardly recognised you, a third posted, as someone else questioned: How skinny do you look?
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Despite Hollys refusal to speak on the issue, Director of London-based Body Control Pilates, Lynne Robinson, has helped the presenter on her journey.
She told The Sun:I worked with Holly for several months, teaching her privately at the home once a week.
Holly had postnatal matt work classes which concentrated on strengthening and toning her core.
The exercises help trim the waist and flatten the stomach.
Holly Willoughby married Dan Baldwin, a producer on Ministry of Mayhem, on 4 August 2007.
She had her first child Belle in May 2009, her second Harry in April 2011 and her third child Chester in September 2014.
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Holly Willoughby weight loss: Star has revealed THIS about her post-baby figure - Express.co.uk