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The couple - who have six-month-old daughter North together - have their sights set on having a spectacular ceremony at the royal château, which is located southwest of Paris, and money is no object to Kim and Kanye.
A source told Us Weekly magazine: "Kanye has never been married and wants a big wedding. They are not working with a budget."
When Kim was 19 she married music producer Damon Thomas in 2000 but they split in 2003 when he filed for divorce.
The sexy star then tied the knot with her second husband, basketball player Kris Humphries, in a $10m wedding in August 2011, but filed for divorce just 72 days later.
Kanye, 36, popped the question earlier this year when he rented out the whole of San Francisco's AT&T Park stadium and presented Kim, 33, with a 15-carat diamond ring while fireworks exploded in the sky.
Kanye is taking responsibility for planning the big day, which he wants to be the ''biggest show on earth'', and Kim is happy to let her fiancé take control.
A source previously said: "Kanye has a very specific vision of what the ceremony should look like and this won't be an understated or intimate event ... Kim is just letting Kanye take charge, as she has done with all other parts of her life. She is being consulted on everything, but it's very different from how Kim handled her wedding to Kris. That was Kim's wedding. This is going to be Kanye's wedding."
