Telling Your Kids They Are Going To Big Sister/Brothers

Nicole
We are expecting our 6th child (our 4th together and I got 2 extra children to love when we married) in May. I'm looking for a fun way to announce our children they will be getting another sibling! We've always just been like, •hey guys! We are having a baby!• so I'd like to do something special this time! 
Any ideas are welcomed!