The couple are concerned about the attention 13-month-old North receives from photographers, so have taken drastic measures to allow the youngster and her nanny to go out undetected, reported OK! magazine.
"Kim and Kanye hired the lookalike to shield North from the paparazzi. There were auditions held in LA at a specialist agency and in the end they found a child who is the spitting image of their daughter," a source said.
"They also hired a body-double nanny, who they hope will really throw paps off the scent."
North isn't the first celebrity offspring to have a double, as it was revealed last year that Suri Cruise the daughter of Tom Cruise and his ex-wife Katie Holmes - also had a decoy.