I bet you are excited. Are you getting her as a pet or for breeding? I can't wait to see pictures of her. How big is she now? How are the personalities of your males? Bringing a female into the house can create a new set of problems, especially if she is not going to be spayed. You will have about four to 6 months before you have to start dealing with that. I bet your 5 month old boy will love having a playmate. Hopefully no jealousy will develop between the two males. You know the saying, two is company and three is a crowd.
You will just need to watch them closely. Do your males have the run of the house of do you have a special area for them? I can't wait to see pictures of your new baby.