Music and fashion stars Sophie Ellis-Bextor and Pearl Lowe have joined forces to donate photographs celebrating motherhood to raise money for charity around Mother's Day next Sunday.

Ms Ellis-Bextor has provided an image of her as a baby, being held by her mother, ex-Blue Peter presenter Janet Ellis, while the image chosen by singer-turned-designer Ms Lowe features a picture of her two daughters, Daisy and Betty.

The Smilers stamps for Royal Mail are being put on eBay for an auction which closes on March 17, with the money raised going to Women's Aid, a charity working to end domestic violence against women and children.

This is the fourth year of the charity initiative from Royal Mail, which has raised considerable funds for Women's Aid with the help of stars such as Helena Christensen, Rankin, Penny Stewart, Elizabeth Hurley and Jasmine Guinness.

In the past, people have paid as much as £2,000 for a sheet of stamps.

Ms Lowe said: "This is a terrific initiative to be involved in, and a very special cause. I've chosen an image that is really special to me, and one I love looking at as it reminds me of the beauty of motherhood."

Julietta Edgar, Royal Mail head of special stamps, said: "This auction has proved to be so popular in recent years, and we are delighted that Sophie and Pearl have come on board for 2010.

"We are keen to raise as much money as possible for this worthwhile cause, so get bidding!"