Kourtney Kardashian Suffers Wardrobe Malfunction at Kendall Jenner's Birthday Party

Kourtney Kardashian Suffers a Wardrobe Malfunction at Kendall Je…

Tristan Thompson's Mom Dead After Reported Heart Attack

How Kim Kardashian Feels About Kanye West's Alleged New Wife (So…

Beyoncé Stuns in First Live Show in 4 Years for Dubai Performance

Beyoncé Surprises Crowd With Blue Ivy Cameo on Stage During Duba…

Val Chmerkovskiy and Jenna Johnson Welcome First Child Together

How 'The View' Honored Barbara Walters With Co-Host Reunion

Gabby Windey Teases What Fans Can Expect From 'DWTS' Tour (Exclu…

'Magic Mike's Last Dance': Behind the Scenes With Channing Tatum…

Nikki Bella and Artem Chigvintsev on Their Paris Wedding and Not…

TLC's Chilli and Matthew Lawrence Dating After His Split From Ch…

Vinny Guadagnino Clarifies Gabby Windey Dating Rumors and Relati…

Ken Block, Racecar Driver and DC Shoes Co-Founder, Dead at 55 Af…

Sherri Shepherd Recalls Barbara Walters Fighting to Cast Her on …

Skip Bayless Emotionally Speaks Out Following Damar Hamlin Comme…

Angela Bassett's Son Shares an Apology After Michael B. Jordan T…

Damar Hamlin: Medical Expert Gives Insight Into Athlete’s Condit…

'90 Day Fiancé': Big Ed’s Ex Rose Exposes Him for His Alleged Li…

'Varsity Blues' Mastermind Rick Singer Sentenced to 3.5 Years in…
Darn you, see-through clothing!
Kourtney Kardashian suffered a wardrobe malfunction at Kendall Jenner's 20th birthday party in West Hollywood, California on Tuesday.

As you can see, the 36-year-old looked on point as usual, despite the sheer fabric on her top exposing a little nipple. Also, please note that sister Khloe's bob is looking choice as hell right now.
The proud older sister was clearly having the most fun, as she went a little nuts with the Instagram posts congratulating Kendall on her big day.
"I have the weirdest pics of us in my phone! My baby Kenny have a magical birthday," Kourtney wrote on one post.
From the look of things, it was one big party.
WATCH: Kourtney Kardashian and Kids Dress Up As Cutest Superhero Family for Halloween
Aww, what a proud sister!
Kourtney has been killing it lately, after her split from longtime boyfriend Scott Disick in July. Despite their problems, Kourtney has been adamant about not keeping the couple's three children, 5-year-old Mason, 3-year-old Penelope and 10-month-old Reign, away from their father. Last week, the kids, along with grandma Kris Jenner, went to visit Scott in rehab, and even though Kourtney wasn't there, a source tells ET it was her idea.
WATCH: Kourtney Kardashian Reacts to Scott Disick's 18-Year-Old Model Girlfriend
Watch the video below for all of Kourtney's killer post-breakup looks!