The TV presenter has called on the public to nominate mothers who have gone above and beyond the call of duty in helping others.
"I'm thrilled to be part of the Tesco Mum of the Year Awards," Van Outen said. "Mums are so important and are our country's true unsung heroes.
"There are so many mums across the UK who are inspirational, courageous and selfless and most have no idea how special they are - so it is great to be part of a campaign that recognises them."
She added: "If you know a mum who has done something amazing for charity, improved her local community or who always puts others before herself despite having challenges of her own, nominate her now!"
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Nominations for the eighth year of the awards close on September 21 and the ceremony will be held at London hotel The Savoy in March 2013.
Editorial director of Tesco magazine Maureen Rice said: "We are all extremely excited about the Tesco Mum of the Year Awards 2013 and feel The Savoy is the perfect place to honour our winning mums with a fabulous ceremony.
"We're very proud to have been holding our awards for eight years. During that time, we have heard so many truly incredible stories and it's been a privilege to recognise these inspirational women. We can't wait to meet our 2013 winners!"