MAR. 31, 9PM
Kourtney Kardashian, Penelope Scotland Disick, Scott Disick, Mason Disick

London Ent/Splash News

Does officially turning the big oh-three make Mason Disick a big boy now? We're sure it does, but to his mom, Kourtney Kardashian, and the rest of the Kardashian fam, he'll always be their little Mason.

"Happy Birthday to my most precious angel who has forever changed my heart," Kourtney posted. "I will never forget the day you entered my life, three years ago. It is an honor and a joy to watch you grow every day."

While aunt Khloé Kardashian Odom is finding it hard to believe that her nephew is growing so fast.

Kourtney Kardashian, Mason Disick

Brett Kaffee/Thibault Monnier,

"I can't believe my adorable, silly, smiley nephew is 3-years-old today!!!!!!" Khloé blogged. "I have fallen more and more in love with Mason each day since the day he was born and I am so grateful for every moment I've shared with him. Thank you Kourtney and Scott for giving us this perfect little person."

And what would a three-year-old birthday be without some love from Kim Kardashian? "I can't believe Mason is turning three today!" Kim posted. "He has changed my world in so many ways and I am amazed every day by him. He is the world's greatest big brother to Penelope and the most loving nephew any aunt could ask for."

We've loved watching Mason grow up too, and we can't wait to see what he gets into with his mom and aunt this season on Kourtney & Kim Take Miami coming in January only on E!

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