29-year-old Khloe took to Twitter yesterday (19 November) to stand up for her 18-year-old sibling, after Kendall revealed a "sneak peek" of a risqué shoot she had done with famed photographer Russell James, which some deemed to be inappropriate.
The picture shows model Kendall wearing a sheer black jumper that reveals the outline of her breasts.
Her hair appears to be wet and is left hanging across her face, while she stares intently at the camera with her striking dark brown eyes.
Kendall uploaded the braless snap on Instagram and wrote: "sneak peak of today's shoot with the amazing @nomadrj ... can't wait for you guys to see the rest of the photos!"
Unsurprisingly, her image caught everyone's attention and Khloe - who is currently in Australia - felt the need to step in and support her little sister.
Writing on Twitter, Khloe said: "Gorgeous @KendallJenner!!! High fashion! Model your booty off and show them how its done!!! Major Model Moment!"
"I love seeing all of these haters comments. Naomi, Kate, Cindy.... All fabulous models.... Models and photographers take beautiful artistic images. And I don't hear you birds chirp then. Sit down and enjoy the view! #SorryNotSorry".
Kendall swiftly re-tweeted Khloe's message.
The brunette model turned 18 years old earlier this month and celebrated with her friends and her Kardashian-Jenner family, who took her out for a masked dinner and presented her with a gorgeous cream cake.
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