Kardashian Sisters Wear All Black to 'Cosmo' Birthday Party

Khloe, Kourtney, and Kim Kardashian wear all black while hitting the red carpet at Cosmopolitan’s 50th Birthday Celebration at Ysabel on Monday (October 12) in West Hollywood, Calif.

The reality star sisters were joined at the event by their younger sister Kylie Jenner, who opted for a white outfit and temporary blonde hair, and mom Kris Jenner.

“I didn’t get the ‘wear all black’ email,” Kylie wrote on her Instagram account along with a photo from the carpet. To comment on her blonde hair, she wrote, “Just for the night.”

Earlier in the day, Khloe took to her Twitter account to respond to comedian Amy Schumer‘s jokes about her and her family during Saturday Night Live.

FYI: Kourtney is carrying a Kayu clutch.

40+ pictures inside of the Kardashian-Jenners on the red carpet…