The former actress turned child's author, who recently gave birth to her second child with husband Tom Fletcher, said she wanted to give a "supportive cheer" to all the mums out there when speaking of her win.
"I feel really flattered," she said. "I'd like to say a big thank you to everyone who voted and a shoutout to mums out there plodding their way through the highs and lows of motherhood."
"It's been a busy couple of weeks with the birth of my beautiful little boy Buddy, looking after Buzz and keeping on top of work," Fletcher continued.
"It's definitely a balancing act between family life and my career, but I'm taking things easy for the time being and enjoying the time with Tom and our two wonderful little boys."
Speaking of her win on Instagram, she continued: "This was a really unexpected surprise.
"I never think I'm doing anything right as a mum, but I don't think any of us do. Sending out a big cheer to all the mums and dads out there who are simply doing their best."
The award by icelolly.com, now in its 15th year, involved open nominations on their website to give the public the chance to vote for who they wanted on the shortlist.
Once the top 10 was revealed, members of the public were able to vote for who they wanted to be crowed the winner.