Kris Humphries Demands $7 Million From Kim Kardashian?

Sources directly connected to Kris tell TMZ ... the bballer -- through his Minnesota lawyer -- has given Kim an ultimatum ... either pay up, or endure an ugly, public trial.

Our sources say Kris and his lawyer have been told to pound sand, and with good reason.

For starters, even if there wasn't a prenup, the marriage lasted a grand total of 72 days, so the community property wouldn't be in the universe of $7 mil.

Second, there was an iron-clad prenup, which provided that Kim owes Kris zilch.

Third, Kris actually MADE MONEY from the marriage. Sources tell us ... Kris raked in around $1 mil from the wedding and the TV special that showcased the nuptials. And Kris made off like a bandit because Kim ended up using a portion of what she got to pay for the ring.