The poll, carried out by fashion discount website FashionPerks.co.uk, found an overwhelming response for the new mum's sense of style.
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The results may have something to do with the 'Kate Effect' – sales of polka dot dresses have soared since Kate stepped out in the sunflower blue Jenny Packham number and fashion brand Seraphine have a four-week waiting list for the floral print wrap dress that Kate wore to leave Kensington Palace.
"It's testament to how dearly the British public hold the Duchess of Cambridge to their hearts," said FashionPerks.co.uk spokesman Max Bramwell.
"She's only been a mother for a matter of weeks, and had barely been seen in public since the birth, yet people are still drawing on her example for inspiration.
"To be honest, she was stylishly dressed before her pregnancy, looked fantastic in maternity wear despite her well-publicised problems with illness, and now the British public expect her to be very much the fashion icon for the coming years."
Another mum included in the top five was Amanda Holden, who is mum to Alexa, seven, and one-year-old Hollie Rose. The Britain's Got Talent judge came in at number two.
"There's huge love for both Amanda and Angelina," added Max.
"Both have come through incredible troubles with dignity, and they've emerged as shining examples of parenting."
Abbey Clancy took fourth spot, while Kim Kardashian was number five.
Kim has only been seen once since she gave birth to baby North West back in June. She made her hotly anticipated debut on Friday when she joined her mum Kris Jenner on her talk show, The Kris Jenner Show.
Kim made a speedy appearance via a video link, looking picture perfect in a white shirt seven weeks after giving birth to her daughter, North West.
"Hi Mom, I just wanted to say congratulations on your new show," said Kim. "I am sorry I could not be there, but I am loving life at home right now."
Top five inspiring celebrity mothers:
- Kate Middleton
- Amanda Holden
- Angelina Jolie
- Abbey Clancy
- Kim Kardashian