Kris is strict when it comes to protecting her daughters (Picture: Dimitrios Kambouris/Getty Images for The Business of Fashion)

Kris Jenner sure runs a tight ship.

The 62-year-old momager allegedly forces the boyfriends of her daughters, including Kim, Kourtney and Khloe Kardashian, to sign an NDA document which prevents them from talking negatively about her girls to the media.

As a precautionary measure, Kris is said to have put together a 100-page rulebook which meticulously details what the partners can and cant do in the event that they split from any of the Kardashian or Jenner children.

It could explain why the likes of Lamar Odom, Reggie Bush and Kris Humphries have always spoken so highly of the famous sisters even after their messy break-ups.

Mandatory Credit: Photo by Matt Baron/BEI/REX/Shutterstock (945218dq) Reggie Bush and Kim Kardashian Los Angeles Premiere of ?Transformers: Revenge of the Falleni 'Transformers 2 - Revenge Of The Fallen' is the sequel to the 2007 hit and brings director Michael Bay back together with stars Shia LaBeouf and Megan Fox. The film continues the story of the battle between the Autobots and Decepticons, and the humans caught in the middle, and the scope has been expanded to numerous countries, the most important of which is Egypt and its Giza pyramid complex where the film reaches its climax.
Reggie Bush has never bad-mouthed Kim to the press (Picture: Matt Baron/BEI/REX/Shutterstock)

According to The Sun, a source said of the document: Its essentially a non-disclosure agreement, usually around 100 pages long. It also ties up copyright of any pictures or videos taken during the relationship. Basically they cant sell stories on the relationship or speak badly about them in public.

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Its also accompanied by a handwritten letter from Kris letting you know she will turn to the familys team of lawyers should you break the agreement.

E!s famous family have endured some controversial public break-ups over the past decade. Kim, 37, notoriously ended her marriage to Kris Humphries after 72 days, while Khloes four-year marriage to Lamar broke down in the midst of reports of cheating, drugs and brothels.

Calabasas, CA - Kylie Jenner and Travis Scott hold hands as they head in to Polacheck's for some shopping a few days after her 21st birthday. Could the pair be looking to finally tie the knot? Pictured: Kylie Jenner, Travis Scott BACKGRID USA 13 AUGUST 2018 BYLINE MUST READ: IXOLA / BACKGRID USA: +1 310 798 9111 / usasales@backgrid.com UK: +44 208 344 2007 / uksales@backgrid.com *UK Clients - Pictures Containing Children Please Pixelate Face Prior To Publication*
Kylie is in a happy relationship with Travis Scott (Picture: IXOLA / BACKGRID)

Shedding more light on the strict non-disclosure agreement, the source continued: It goes without saying that if they break it, the Kardashians, E! and every company associated with them will blacklist you for life.

The girls know the deal, its written into their TV show contracts too. They cant date anyone who hasnt signed it. The men have to sign before the first date. They do warn any potential dates – saying sorry, its just the way it is.

More: Kim Kardashian

Most of Kris daughters are in happy relationships: Kim is married to Kanye West, Khloe is with Tristan Thompson, Kylie Jenner is in a relationship with Travis Scott and Kendall Jenner is dating NBA player Ben Simmons.

Metro.co.uk have reached out to Kris reps for comment.

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