It probably happens more when you can catch the Princess with a short line or non existent line. We have the cutest pictures of our oldest now 18, but at the time was 4 1/2 with Jasmine. No one was around and we were on a park bench in the World Showcase by Morocco and she came up and talked with our son for a bit. We have pics of them talking with him getting an autograph, her kissing his check and then just a smile with the lipstick kiss on his cheek. It was a precious moment. The parks were pretty busy it was middle of May when we were there. Not sure how managed this quiet moment with a Princess but glad we did! Maybe you could just mention it to one of them and get the pose. We will be redoing some of our old pics with new ones this trip since my boys are 13 & 18, but doubt the princess will be kissing any cheeks for us.....lmao Have a great trip!