Help! Anyone with announcement creativity?

SO and I are having our first together/due Dec 2019. We both have children from previous marriages. All are teenagers. 13,15,18. We’re ready to give them the news. The 18 y/o will have to be separate as he’s away at college. Anyone had to announce their pregnancy to teenagers before? How did you do it? We want it to be exciting and fun - not just a sit down, we’re going to have a baby conversation. I can’t come up with anything right now. We definitely want to do it before I start showing...help me ladies! 🤗.