Halle Berry once said she'd never marry again ... turns out, she may have changed her mind!
The 45-year-old actress is reportedly engaged to her "Dark Tide" co-star Olivier Martinez, according to Us Weekly.
The mag says Martinez, also 45, proposed over the holidays with an emerald-and-diamond ring from Gurha -- the ring she's been seen wearing for the past week (right).
The two have been dating since Fall 2010.
If true, this will be the third marriage for Halle. She was married to baseball star David Justice from 1993-1997 and tied the knot to singer Eric Benet in 2001 ... only to separate two years later.
She also had a five-year relationship with Gabriel Aubry, the father of her three-year-old daughter Nahla.
This will be the first marriage for Martinez.