Kourtney kardashian scott disick mason

Scott Disick &
Kourtney Kardashian's
Son Mason Celebrates
His Third Birthday
With the Family

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Can you believe Kourtney Kardashian and Scott Disick’s son Mason is already three?

Today, Dec. 14, the tot is celebrating his 3rd birthday in true, over-the-top Kardashian fashion.

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

NEWS: Scott Ditches Kourtney to Party

Though Khloé Kardashian was busy tending to her co-hosting duties on last night's X Factor in LA, Mason's auntie made sure to be there for her nephew’s big day.

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

Thankfully, Kourtney and Scott are pros at throwing big bashes for their first-born. When Mason turned 1 in 2010, the Kardashians threw a carnival-themed party with farm animals, a carousel and tons of food. And when he turned 2, the famous clan threw him a hoedown — 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."