Sitcom star Geena Davis, 44, and Beverly Hills neurosurgeon Reza Jarrahy, 29, became engaged over the weekend, her publicist announced yesterday. It will mark the fourth trip down the aisle for the Oscar winner (1988's "The Accidental Tourist"), whose previous husbands were New York restaurateur Richard Emmolo, actor Jeff Goldblum and movie director Renny Harlin. No date for this new wedding has been set, said the press rep, whose statement about the impending nuptials included the news that the couple met two years ago through mutual friends. When Davis and Harlin split in June of 1997 after four years of marriage, PEOPLE referred to them as "the couple that put the 'strange' in estranged," given their continued friendly and very public appearances together. The Finnish-born Harlin, now 42, whose movies include "Die Hard 2," made Davis an action hero in the big-budget flops "Cutthroat Island" and "The Long Kiss Goodbye," both produced by the couple's own company. This season, Davis launched her own ABC sitcom, "The Geena Davis Show." Despite poor reviews, the show is making its way in the ratings.