How to Surprise Future Big Sister

Hello Ladies, I'm currently 12 weeks pregnant (with my second) and looking for a cute way to share the news with my 6 (closer to 7) year old daughter. We are planning on telling her in a couple weeks but we want to do it in a special way. She's the first grandbaby (she has 3 cousins) from my husband's side so she's experienced not being the "baby" already but I just feel like this is different cause she'll be loosing the "only child" atmosphere/attention, if that makes sence. I'd love to see what ideas come to mind or if you have done this before and took pics of the moment I'd love to see them too!