Creative and fun ways to tell my niece and nephews about my baby!

Hi moms!

I have 1 niece (12 years old) and 2 nephews (1 12 and 1 7 year old) who I am very close with. I can’t wait to tell them that I am pregnant! They’re gonna go nuts haha. What is a fun and creative way for me to tell them? T-shirts? A cake? Lol I’m not creative as you can tell so any fun advice would be appreciated! Thanks! :)