The 39-year-old star - who has children North, seven, Saint, four, Chicago, two, and Psalm, 17 months - joked she is now a "cool mum" to her kids after joining the cast of the animated movie, which will also feature the vocal talents of Jimmy Kimmel, Dax Shepard, Tyler Perry, Marsai Martin, Randall Park, Yara Shahidi, Ian Armitage, and Will Brisbin.
Kim wrote on Twitter: "I'm an officially cool mom now to my kids! Paw Patrol We're On A Roll!"
The Keeping Up With the Kardashians star also shared a picture of her script.
While she covered up most of it with a dog emoji, there was a handwritten line which read, "Ryder, Ryder, it's Delores," hinting the latter could be her character's name.
The movie, based on the Nickelodeon series of the same name, is due to be released by Paramount Pictures on Aug 20, 2021.
Like the TV show, the motion picture will revolve around a young lad called Ryder who leads a crew of search and rescue dogs who are called the PAW Patrol.
The film is already in production, but the cast and crew have been working remotely.
Current cast members are also expected to be part of the motion picture, with the newly-announced stars set to appear as new characters.
In the TV show, the characters live in dog houses, but fortunately they turn into vehicles the pooches use for their missions, protecting the Adventure Bay community.