*Divorcing couple Mariah Carey and Nick Cannon find themselves together again…as the target of a lawsuit.

Their former nanny, Simonette DaCosta, claims the former couple fired her because she showed too much affection toward “dem babies.”

According to TMZ, she was the full-time nanny when twins Moroccan and Monroe were just infants. DaCosta claims the singer berated her for showing too much affection.

DaCosta also claims she was worked too hard … putting in lots of OT — sometimes 100 hours a week, reports TMZ.

She wants back pay and other damages.