The two babies looked cosy in matching pink pjs as they snuggled up for a photo.
Stormi, who is five months old, is the daughter of the make-up mogul and Keeping Up With The Kardashians star Kylie Jenner.
The child, whose father is rapper Travis Scott, clutched onto a toy in the shot captioned: "Slumber party."
Chicago is the third child of her older sister Kim Kardashian and rapper Kanye West.
She was born by a secret surrogate in January.
The shot sent fans into meltdown and they took to Instagram to show their appreciation for it.
One said: "This is so adorable."
Another wrote: "Twins," while a third joked: "Get your elbow out of my neck."
Meanwhile Kardashian sister Khloe gave birth to her first baby True in April.
The birth came days after her baby daddy had 'allegedly cheated' on her.
The Sun Online revealed a video of basketball star Tristan appearing to kiss a model in a crowded bar in New York.
Since the birth of their tots, the reality TV queens have been treating their fans to pictures of their new borns.
Kim posted a cute shot of Chicago and True most recently which sent fans into a frenzy.
In the shot the two little ones are sat next to each other.
Chicago rests her arm on a giggling True alongside her – and Kim captioned the shot: "I got this True."
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