Imaginary Friends

This whole imaginary friend thing is all new to me. My 7 year old son never went through the imaginary friend phase of is life,so I'm a little unsure on how to handle this new phase that Ezra is going through. He has an imaginary kitty cat that he named Skeeter. He is Red and is a girl. He walks around with his hands together like he is carrying her through the house and he puts her to bed and feeds her cheerios.. It really is the cutest thing but I'm not sure whether this is good or bad.. thoughts please...