Mystery sticker 5??? – Lalaloopsy Girls - Cloud Sculpting Review

I admit I enjoyed this much more than expected considering my daughter downloaded it on her iPad and since ours our linked it popped up on mine. I have been on a mission to collect all the stickers and I'm only missing 1! How do I get the mystery sticker 5? ?
Review by Mallys closet on Lalaloopsy Girls - Cloud Sculpting.