Portman's rep confirms to E! News that the 29-year-old actress is betrothed to her costar and pregnant with his child.
It's been a fairy-tale romance for the two, who first met on set of their ballet movie last year...
Her French-born fiancé has been a professional ballet dancer since age 8, and choreographed the dancing in Black Swan, in addition to starring opposite Portman.
This has been a phenomenal year for the Harvard-educated actress, who's scored Golden Globe and SAG Award nominations for her portrayal of a ballerina on the verge of a breakdown.
People was first to report the happy news.