Happy birthday to you, squashed tomotoes and stew, I saw a big fat monkey, and I thought it was you! First of all, let's all say happy birthday to Horrid Henry. He's actually 20 years old today! Now say hello to your drawing teacher… it's none other than… drum roll… Tony Ross, the illustrator of all the Horrid Henry books written by Francesca Simon. What better way to celebrate 20 years of Horrid Henry than by drawing the little monster? As Tony says, it all starts with a banana… You can get hold of the latest Horrid Henry story Horrid Henry's Krazy Ketchup from June 5 2014. Photograph: Tony RossPhotograph: Tony RossPhotograph: Tony RossPhotograph: Tony RossPhotograph: Tony RossPhotograph: Tony RossPhotograph: Tony Ross