Bailey's "friends"

For a few weeks now Bailey has had a new "friend." One day she introduced me to "Evan"...an imaginary friend. He goes with her EVERYWHERE. I do not know where she came up with his name (not sure if she got it from Pandra and Brian's son's name, Evan or got it from somewhere else.) She says he is her brother. Two days ago she was watching Blue's Clues and now "Steve" has joined her and Evan. It's pretty funny. She told us Evan is four like her. We have to make sure we do not sit on him or leave him in his car seat or outside the Jeep. Very dramatic.