Celebrity Kim Kardashian West Shares the Cutest Video Ever for North West's Third Birthday By Jennifer Davis Jennifer Davis Twitter Jennifer Davis is a writer, editor, and content strategist living in Atlanta. She was previously the Associate Editor for InStyle, and is currently working as a Digital Content Manager at Cox Business. InStyle's editorial guidelines Updated on June 15, 2016 @ 03:45PM Pin Share Tweet Email Photo: Gilbert Carrasquillo/FilmMagic If you can believe it, it's been three years since Kim Kardashian West and Kanye West welcomed their adorable daughter, North. But if we're in shock that today is her third birthday, her mom is even more blown away by how quickly the years have passed by, and she took to her Instagram account to express her disbelief with a short video. In the clip, she asks the newly-minted three year old to not grow up. "You're not going to get any bigger. You're not going to get any taller. You're going to stay little forever, OK?" she says to North, who looks as stylish as ever in a colorful printed one-piece PilyQ bathing suit. "K!" the toddler responds. Too cute. "She promised me she wouldn't get any bigger," the reality star captioned the short video. "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!!!" 13 Times Kim Kardashian and North West Wore Matching Outfits Kim wasn't the only member of the Kardashian-Jenner clan to wish North a happy third birthday. Aunt Khloé Kardashian posted a cute photo of her lifting North in the air. "Happy birthday Northie! My baby! My heart! KoKo Loco loves you!" she captioned the sweet shot.