Someone needs to tell Kourtney Kardashian about the 'blood is thicker than water' expression, after she failed to recognise Kendall Jenner in a new magazine campaign. This is kind of funny.

25-year-old The Kardashians model Kendall took to Instagram yesterday [6th September] to share a series of photos from a new W magazine spread for their 50th anniversary issue. Tagging photographer Rafael Pavarotti, in the first photo she wears a head to toe red leather look with matching fishnet stockings, while in a third she wears an Adidas x Gucci maxi dress.

But it was the second post - the cover - that got sister Kourtney's attention, which shows Kendall in a blonde Marilyn Monroe-esque wig, a floor length fur coat and a sequin dress.

"Honoured to be a part of @wmag 50th anniversary issue by @rafaelpavarotti_," Kendall wrote. Kourtney commented, "I was like why is Kendall posting this random girl ๐Ÿ˜น๐Ÿ˜ฟ๐Ÿ˜๐Ÿ˜๐Ÿคฉ"

To be fair, with the blonde wig and the eclectic outfit, we know what Kourt means - Kendall doesn't really look like Kendall. The comment racked up over 700 likes, with someone replying, "๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚" and another putting, "I literally thought the same thing ๐Ÿคฃ."

Most recently, Kendall went viral for wearing a vintage Dolce & Gabbana dress, which was previously worn by iconic noughties supermodel Gisele Bรผndchen on the runway during Milan Fashion Week in 2000. A major fashion moment if you ask us.