Diddy's Baby Mama -- Bank Forecloses on Her House

The gravy train appears to have come to a screeching halt for the mother of Diddy's firstborn son -- TMZ has learned, the bank is now foreclosing on her home.

According to new legal docs, Diddy purchased a swank 3-bedroom 3,215 sq. ft. house in Westchester, NY, back in 2003 for ex Misa Hylton-Brim -- the mother of his first child Justin -- but for some reason, the bank stopped getting payments in 2010.

According to legal docs, Diddy took out a $712,000 mortgage. As of 2010, he owed $622,518 ... a sum that's been accruing interest ever since.