Have you read the Llama Llama series by Anna Dewdney? They are Katie's favorite. She pretty much has them memorized and we read them every day. I love the rhyming in the books.
The other night Katie and I were reading this particular book, "Llama Llama Red Pajama". I leave parts of the story out so the kids can fill in the blank. We started "Llama Llama....I waited for Katie to fill in the blank and she looked at me and said "Don't you know?" I laughed and laughed. My daughter has got a fantastic personality.