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."