James and Oliver Phelps pose with a small stuffed bear to support the Avon Walk for Breast Cancer.

The twins are just two of the hundreds of celebrities that have participated in Project Teddy Bear, an organization started by Lisa Spodak, who has walked in over 20 Avon Walks!

There are currently over 40 signed breast cancer bears being auctioned off, including James and Oliver‘s bears, as well as one signed by Emma Stone (pictured below).

If you win one of the signed bears, you even get a picture of the celeb holding the bear! Help support the fight against breast cancer by bidding now on eBay.