North was treated to a day out at the theme park by her parents, where she dressed up as a princess in a pretty pink dress, reported Female First.
Kardashian shared a picture of her on Instagram and wrote, "Thank you @disneyland for making all of my princess dreams come true today!"
The 35-year-old star also shared a video of her and North. She captioned the video, writing, "she promised me she wouldn't get any bigger. I can't believe my baby girl is 3 years old today!! Northie I love you so much I can't even explain it! Happy Birthday to my favorite mermaid!!!"