The singer joined Strictly Come Dancing star Matt Di Angelo along with the regular hosts of the kids' TV show to kick off the appeal.
Disc Drive is attempting to get children across the country to donate their unwanted CDs, DVDs and computer games.
The show is aiming to net 250,000 unwanted discs, which can then be sold around Barnardo's stores nationwide.
Money raised from the donated CDs will go towards helping the charity's work with young carers.
Tim Levell, editor of Blue Peter, commented: "We're delighted to be working with Barnardo's to support its fantastic work with young carers.
"We want to get our viewers across the UK excited about collecting discs by the thousand so they can make a real difference to the lives of these amazing children."
Blue Peter presenter Andy Akinwolere has spent 25 hours living the life of a young carer to give viewers an understanding of the pressures they are under in everyday life.
Martin Narey, Barnardo’s Chief Executive, said: "We are thrilled to be the beneficiaries of this year’s Blue Peter Appeal and hope that its viewers will really get behind this exciting initiative."