Natalie Portman felt a real brotherly bond with her BROTHERS co-stars Tobey Maguire and Jake Gyllenhaal during filming because they all grew up together in the movie industry.
The Star Wars beauty, 28, appears in the drama as Maguire's wife, who falls for his brother, played by Gyllenhaal, after her marine husband is presumed dead while on a tour of duty in Afghanistan.
And the actors felt so close to one another, they turned rehearsal sessions into social get togethers by relocating from the movie studio to one another's houses.
She tells Star magazine, "This is the first time I've worked with actors I knew before! I met Tobey when I was 14 and Jake when I was 18. We rehearsed in each other's houses, so there was familiarity from the first day."