Janet Jackson and her super rich businessman husband have split just months after welcoming a baby together.

According to reports, Jackson and hubby Wissam Al Mana -- who is worth almost a BILLION bucks -- recently came to an agreement things weren't working and decided to go their separate ways.

Al Mana is Janet's third husband ... she married James DeBarge in the 80s but split after a year and was with Rene Elizondo Jr. from 1991 to 2000.