The former Girls Aloud star and TV presenter have also been joined by actress Sheridan Smith, former Strictly Come Dancing judge Arlene Phillips and One Show host Alex Jones in their efforts for the charity.
The campaign which they are fronting asks women to take part in BearFaced Day, which involves ditching the slap in favour of the natural look on Friday 8 November. Instead of make-up, they are asked to pop on a little Pawprint, available from Post Offices around the UK.
Speaking about the campaign, Kimberley said: "This is such a brilliant way to raise money!"
Laura added: "Join me and hundreds of other women who are going BearFaced, let's raise lots of money for children all over the UK who need your help."
Sarah Monteith, Director of Marketing and Fundraising BBC Children in Need said: "BBC Children in Need is delighted to be bringing BearFaced back in 2013.
"This is a lovely, simple initiative that women across the UK can take part in to help raise money for disadvantaged children and young people who need our help."
Find out more at bbc.co.uk/pudsey and prepare a sponsorship page at here.
Do you find it easy to go without make-up? Let us know below!