Happy birthday, Kourtney Kardashian! Kris Jenner woke up bright and early (as always!) on Thursday to help kick off her eldest child’s 40th birthday celebration. “Happy Birthday Kourtney!!!

Kourtney Kardashian Falls Off Her Bike Into the Sand as She Goes for a Ride on Her 40th Birthday The reality star took a tumble while trying to document her ride on Instagram Thursday ...

Kourtney's two exes Scott Disick and Younes Bendjima were also there. Bendjima, the 25-year-old model Kourtney last dated, posted an Instagram Story from the party, confirming his attendance: ...

Kourtney Kardashian celebrated her 40th birthday in a big way on Thursday, honoring the milestone with a lavish party featuring some brilliantly personalized touches.

Kourtney Kardashian turned up the heat for her 40th birthday on Thursday. The reality star and mother of three said goodbye to her 30s with a star-studded bash.

Another Kardashian party down in the books! Kim, Khloe, Kendall and Kylie all stepped out on Thursday night to attend their oldest sister, Kourtney Kardashian's, 40th birthday party.

Kourtney's once rumored fling, Luka Sabbat, also made an appearance at the party, posing for snaps with Kim and the birthday girl. Kim Kardashian/Instagram Story Kim Kardashian/Instagram Story 1 / 2 ...

See Inside Kourtney Kardashian’s 40th Birthday Party, Which Was Full of LOL Details Kourtney's bash was filled with cheeky Keeping up with the Kardashians decorations.

Kourtney Kardashian celebrated turning 40 the only way the Kardashians know how; with a massive party. The eldest sister celebrated with a naked cake (yes really), and a very daring dress and a ...

Kourtney Kardashian celebrated her 40th birthday with a massive party on Thursday. The Kardashian-Jenner family gathered at Kris Jenner's house with their celebrity friends like Sia and Paris Hilton.

Kourtney Kardashian has entered a new decade! On Thursday, much of the Kardashian family took to Instagram to wish the eldest sibling a happy 40th birthday.