Mel B ended her turbulent marriage to Stephen Belafonte before they reached their 10th anniversary, preventing him from “living off her money for life”.
Under California law, the courts can award indefinite spousal support if a couple have been wed for more than 10 years, which could have put Mel’s £40million fortune at risk.
Mel, who married in June 2007 and has a daughter, Madison, five, with film producer Stephen, 41, filed for divorce on Monday.
Insiders say she is urging him to “play nicely”.
A source said: “Mel is determined to make the divorce as amicable, respectful and calm as possible. She wants to plough on with settling matters and to move on.
“She feels the most mature thing to do is cut their losses and walk away without a fight.”