Hi -- any advice would be appreciated on this topic!

My boyfriend has a 4 year old daughter who I absolutely love to death. She lives with us, because james has full custody, and she is one of the sweetest little girls. She pretty much is like a daughter to me -- I take care of her every day and spend pretty much all of my time with her.

The problem is -- we are both concerned about the best way to tell her that I am pregnant. She is an only child and she is at a stage where I think she will have a hard time accepting the fact that she will have a new brother/sister. I want to be able to approach her with this in a way that she can be excited about it and involved in the planning of her new brother/sister's birth.

Anyone have any advice on the best way to tell her? I know this isn't the most serious advice in the world, but it really would be appreciated!

Thanks!!