The exact name is Disney Princess Dress-Up: My Sticker Book – it retails for $3.99 from the App Store.
The App is basically this generation’s version of paper dolls–you can dress all of the Disney princesses (selecting everything from their tiara to SHOES). There is also a feature where you can put your child’s picture on one of the dolls (on the sample video, the proportions seemed off). While we’re usually not big on the whole be a “princess” mantra…for many girls this app will be very appealing.
You can preview the App on youtube: http://www.youtube.com/watch?v=gwurQ2yAXZU