"Room mates and best friends," the 17-year-old wrote alongside it.
Until Kim and Kanye's house is fully renovated early next year, the family have been staying at Kris Jenner's Calabasas mansion. And while Kendall wasn't a huge fan of the idea when Kris first sprang the news on them, she's clearly getting to grips with her doting aunt duties.
The willowy model also squashed recent rumours that she was dating a 21-year-old rapper, writing: "Enough with the rumours! I'm single, people."
Last week, proud aunt Khloe Kardashian shared a sweet photo of baby North West's hand on her Instagram account. The 29-year-old simply captioned it: "NW."
We also got a glimpse of the tiny tot's hand was when 32-year-old mummy Kim headed out on a dinner date with pal Jonathan Cheban at Mexican restaurant Casa Vega in Studio City, California.
We're not quite sure how a picture of a little person's hand can heap so much happiness on us, but it does - although not as much as the very cute picture that Kim shared of Nori all swaddled up tight in a cosy blanket.