The Kardashian 'momager' has reportedly “gone to extreme lengths” to protect her daughter after multiple women accused Thompson of being unfaithful to Kardashian whilst she was pregnant.
A source told Closer magazine: “She's been quick to issue Tristan a contract - it's like a pre-nup, with various clauses, including one that stipulates Tristan will be forced to pay $1million (£700k) in damages if he cheats again."
According to the source, the Revenge Body star was initially not keen on the idea, however has since agreed.
The insider added: “Tristan was furious about the contract and refused to sign it - accusing Kris of trying to cash in on every situation she could.
“He insisted that it would just push him away, and said that he couldn't be with Khloe knowing he had so many rules and stipulations hanging over his head."
The news comes after Thompson was reportedly spotted having an 'inappropriate encounter with two women' just days after celebrating Valentine's Day with his other half.
The 27-year-old first made headlines after footage of him allegedly kissing a woman who appeared to be Instagram star Lani Blair emerged just days before Kardashian was due to give birth.
And now new reports suggest that the NBA star was spotted flirting with two Kardashian lookalikes back in February.
According to US Weekly sources spotted the basketball player getting “close” to the women at the NBA All-Star Weekend.