Everyone, including the reality star's then-boyfriend French Montana, met in New York City and went out on a yacht to celebrate Khlo's big 3-0.
In this new sneak peek from Kourtney and Khloe Take the Hamptons, we see that Khloe was a little bummed about the milestone birthday.
"Thinking about turning 30 right now is causing me major anxiety," Khloe confesses. "For me, I don't think it's like where I thought I was going to be when I'm 30 years old...I didn't think that I would be divorced with no kids and I just thought my life was going to be different."
In another sneak peek from this episode, Khloe confessed that if it were up to her, she would still be married to Lamar Odom, so we totally understand why she's having a hard time with everything right now and unfortunately the birthday is just another reminder of that.
This episode airs Sunday, November 23 at 9pm ET/PT on E!
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Gallery | The Adventures of Khloe Kardashian and French Montana