The 45-year-old actress - who was previously married to baseball player David Justice for four years until 1997 and tied the knot with Eric Benet in 2001 before separating two years later - is set to tie the knot with her `Dark Tide` co-star after the 46-year-old Frenchman proposed with an emerald-and-diamond ring. A source told the new issue of Us Weekly magazine: "Halle had given up on being married, but she trusts Olivier. He makes her feel safe. He`s a keeper!" The actress agreed to marry Olivier - who she has been dating since autumn 2010 - because she was impressed with how he treats Nahla, her three-year-old daughter with former boyfriend Gabriel Aubry. A source said: "Halle is very serious about this marriage. She`s ready. Olivier has become her rock. "Halle feels Olivier has made a connection and a commitment to her and her daughter." The couple would love to have a child together and friends say they will consider adoption if they can`t conceive naturally. The insider told America`s Star newspaper: "Halle would love to have more kids, but she knows it might be difficult because of her age and the fact that she`s diabetic. "If they can`t conceive, they`d definitely consider adoption." The pair are expected to tie the knot in California early this summer and Halle is said to be happier than ever. The source said: "Deciding to marry again is huge for Halle. But friends have never seen her this happy and fulfilled."