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We can hardly believe North West is already 3-years-old, and it appears her mama Kim Kardashian is feeling the same way.

The reality star took to Twitter to share a video of the adorable, little birthday princess, making her promise to stop growing up so fast.

"You're not going to get any bigger. You're not going to get any taller. You're going to stay little forever, OK?" Kimmy asks Nori, who dons a colorful one-piece bathing suit. 

"K!" North responded, smiling from ear-to-ear in the cutest way. Kim continued, "And you're not going to eat your veggies because I want you to stay really small!"

What toddler could say no to that!?

North West

Instagram

Kim also took to her app to share a sweet birthday message to for the toddler.  "The joy of my world, my best friend—I would be lost without you," she wrote. "I've loved seeing you grow up, and I can't wait for many more amazing years. I love you, my bubs!"

The birthday girl and her parents, Kim and Kanye West, appear to be vacationing in some tropical location (Kim said she's watching the waves, getting tan and drinking piña coladas on her app). In fact, just yesterday Kim shared a hilarious photo of Nori giving her mama major side-eye while soaking up the sun.

"MOOD," Kim captured the adorable pic.

Despite the attitude, North looked flawless in a black bathing suit and sunglasses, while sitting on top of her dad's lap (who also donned black). Her curls were blowing in the wind as a sea of turquoise surrounded them.

Stay tuned for an all new Keeping Up With the Kardashians this Sunday at 9 p.m., only on E!