This is the inside of the Celebrate card.
Yep, it's a pop up card. I love these cards.
I took a second sheet of white CS cut to the same dimensions as the front piece.
The best place to see how to make a pop up card is on Splitcoast Stampers. I then adhered a present glittery sticker to the pop tab with a dimensional. The word Happy is from K & Company. Thanks for looking!