Rob Kardashian Didn't Go to Kourtney Kardashian's 40th Birthday Party - The Blast

Kourtney Kardashian rang in her 40th birthday with a bang, and was surrounded by all her famous friends and family members … well almost all of them.

The party went down Thursday night at Kris Jenner‘s mansion in Calabasas and it was quite an over the top bash, complete with an elaborate cake featuring Kourtney in her birthday suit sitting in a soapy bathtub.

Among the stars who attended; Kanye West, Quavo, French Montana, Travis Scott, O.T. Genasis and Paris Hilton. “Happy Birthday” was performed by Robin Thicke and Sia. The party also featured some rules, including no balloons and no mentioning Kourtney’s age.

Kim Kardashian and Paris Hilton

The amazing event was thrown by Kim, Kris, Khloé, Kylie and Kendall … but unfortunately Rob Kardashian was nowhere to be found. The only brother of the Kardashian sisters has not been seen at any of the family’s parties for years, and has not led an active public life since the breakup and ongoing legal problems with his baby mama, Blac Chyna.

Although Rob didn’t show, Kourtney still had some of the important men in her life attend her birthday party — including baby daddy, Scott Disick, and ex-boyfriend, Younes Bendjima.