Wil Anderson, Scott Cam, Brook Hanson, Isabel Lucas, Jason Smith and Michala Banas are just some of the celebrities to have supported past Clown Doctors Smile Day, on again this year in April.
Clown Doctors work in hospitals all over the country, helping sick kids smile, which helps to improve their health.
Show your support for Clown Doctors this Smile Day, on 1 April.