How Kourtney Kardashian and Scott Disick's Son Mason Is Celebrating His 3rd Birthday (EXCLUSIVE)

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Three years ago, Kourtney Kardashian and Scott Disick's lives changed when they welcomed their first baby boy, Mason.

And today, Dec. 14, the tot is celebrating his 3rd birthday — in style.

"Mason's birthday party will be held at Serendipity 3 in Miami," a friend close to Kourtney reveals to Life & Style. "All of the family is going and it will be a big thing."

Though Khloé Kardashian was busy tending to her co-hosting duties on last night's X Factor, Mason's aunt made sure to be there for the little guy's big day.

PHOTO: Kourtney Kardashian and Scott Disick's early birthday present for Mason

"Khloé took the 10:15 p.m. red-eye flight from Los Angeles International Airport on Dec. 13 on Virgin America," an eyewitness tells Life & Style. "She sat in first class. The plane landed in Miami around 5:15 a.m."

When it comes to Kourt and Scott's son, they've always thrown quite the bash on his birthday. When he turned 1 in 2010, the Kardashians threw a carnival-themed party with farm animals, a carousel and tons of food.

"I think I had just as much fun as Mason and the other kids did that day," his aunt Kim Kardashian shared.

PHOTO: Kourtney Kardashian and baby Penelope enjoy beach day with Scott Disick and Mason

And last year, to celebrate his 2nd, the famous fam enjoyed a Western-themed party — complete with cowboy hats and red bandanas.

"Happy Birthday to my most precious angel who has forever changed my heart," Kourtney, 33, wrote on her website Friday. "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."

But this year will be a bit different with 5-month-old baby sister Penelope around! We can't wait to see how it all turns out!

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