Kourney Kardashian, Ex Scott Disick celebrate son Mason Disick Bar Mitzvah birthday party

Kourtney Kardashian and Ex Scott Disick’s eldest boy Mason Disick is thirteen.

At a bar mitzvah party on December 17, Mason Disick, the oldest son, turned 13 with his family and friends.

Parents of the guest of honor, who split up in 2015 and share custody of their three children, were seen arriving separately at the location, the Offsunset lounge in West Hollywood.

Scott entered the party with his wife's youngest child, son Reign Disick, 8, and Kim Kardashian's eldest daughter North West, 9.

Kourtney's sister Khloe Kardashian posted pictures from the event, showing herself with Mason's sister Penelope Disick, 10, and North West, 9.

Kim, Saint West, age 7, Kylie, Kendall, and family matriarch Kris Jenner were also seen at the party.

Mason is the oldest of the momager's 12 grandchildren, and his father Scott is a Jew. The now-teen is the first child in the illustrious family to have his or her bar mitzvah, or Jewish coming-of-age ceremony.