The reality star commemorated her special day with a lavish, personalized b-day bash.
In honor of the 'Keeping Up With the Kardashians' star's 40th birthday, ET counts down Kourt's funniest quirks.
Kim, Khloe and Kris sent so much love to Kourtney!
In honor of her 40th birthday, we're looking at the lifestyle habits of the aging-backward reality TV star.
Kim Kardashian West once called her "the least interesting to look at" of the sisters, but we beg to differ!
Kanye's little girl and Kourtney Kardashian's daughter stole the spotlight during the mysterious musical service.
The 'KUWTK' star is on good terms with her ex's new girlfriend.
"Spring Break is over."
"My past with Scott has always been complicated."
This might be Kourtney's creepiest look ever!
In a new 'Vogue' beauty tutorial, Kourtney reveals she's not a fan of the contoured look.
The 'KUWTK' star unveils her mysterious project following multiple skin-baring posts on Instagram.
Kourtney Kardashian also reveals what she almost named her son, Reign.
Khloe, Kim and Kourtney Kardashian were guests on Monday night's 'Jimmy Kimmel Live' where they dished on dating, and baby names!
