This holiday, you can give the gift of joy to children suffering from serious illnesses, with the macy's believe campaign. What you need to do is write a letter to santa. Bring it to any macy's store.... See More
This holiday, you can give the gift of joy to children suffering from serious illnesses, with the macy's believe campaign. What you need to do is write a letter to santa. Bring it to any macy's store. For every stamped letter dropped in a mailbox like this one right here, the store will donate $1 up to $1 million to make-a-wish. We can make dreams come true like for 11-year-old annie. Right here. Reporter: Annie lohan is a girl with a big heart. Annie was still a newborn when doctors diagnosed her with cystic fibrosis. I was there every day. I was not going anywhere. Reporter: Ever since, her condition has required frequent stays in the hospital. Her first couple stays were very, very rough, being that she also has autism. Reporter: None of it dimmed her imagination, which she put to use coming up with her wish. I want my wish to be dancing with a prince at a ball. A real prince. Reporter: At make-a-wish's fund-raising event, syracuse university's jim boeheim had a surprise for annie. You will get your first dance by an italian prince. Reporter: She shops for a gown. Trying on one after another, just like a real princess. It makes you want to cry. You're used to seeing the other side of it. It's just amazing. Reporter: That evening, a police escort brings annie and her family to graystone castle. She waves to the crowd that's gathered for her arrival. Then -- annie? Reporter: The moment she has been waiting for. Meeting her prince charming. I bow to you. Prince lorenzo and princess annie. Reporter: The pair take to the dance floor. ♪ and annie's wish becomes reality, on her 11th birthday. A storybook ending for a true princess. All about making wishes come true. Thanks to chris connelly for that. And so far, we have 638,612 letters and counting.
This transcript has been automatically generated and may not be 100% accurate.