TMZ broke the story ... Kris' mom Debra filed for divorce from his dad earlier this month in Minnesota, citing an "irretrievable breakdown" in their marriage. They were married in 1982.

Now, TMZ has learned, Debra and Kris' dad William settled their affairs long before Debra filed papers -- because when she filed the divorce docs, she included a settlement agreement already signed by both parties.

According to the agreement, neither party will be awarded spousal support. William gets the couple's Chaska, MN home as well as the BMW, the boat, the grand piano ... and whole lot of credit card debt.

Both parties will go their separate ways with their own cash, checking, and savings accounts. William will pay all attorneys' fees. No mess, no fuss.