Each pebble has been personally signed by the celebrity who painted it and they also come with an authentication certificate.

A total of 24 beautiful pebbles are up for grabs in this one-of-a-kind auction including world-famous children’s illustrator Axel Scheffler’s pebble, which is pictured.

Brian Blessed, Kenneth Branagh and Paralympian Ellie Simmonds have also joined the campaign.

Momentum says painted pebbles can mean a lot to children and the charity has given away more than 600.

A Momentum spokesperson says;

“We found that children visiting our respite cabins enjoyed decorating pebbles and leaving them in the beach hut for others to see and this inspired us to do more. Now, when a child is diagnosed, a personalised, decorated pebble is given to them.

“Our celebrity pebble auction is now LIVE and you have until 11am on the 11th of October to place online bids.

There will be a live auction at Windsor Auctions in Windsor where bidders can come along and make bids for the celebrity pebbles in person.

Bidders are also invited to make phone bids by calling Windsor Auctions on 01753 868076. Take a look at our fantastic celebrity pebbles, place your bids and help us raise as much money as possible.”

Click here to place your bid.