Legendary casting director Bonnie Timmermann — whose career is the subject of a new documentary — has revealed how she discovered stars including Kate Winslet, Benicio del Toro and Natalie Portman.

“It’s like I am looking at somebody across my desk and in my mind there is a screen behind them and I either see them on the big screen or I don’t,” Timmermann told us of her process. “It could be a Broadway play or radio show, anything. You either see it or you don’t see it. I don’t know that I have a trained eye, but my heart kind of tells me what to do.”

While Timmermann, 77 – who recently worked on the new movie “Roofman” starring Channing Tatum and “The Very Best People” with Lili Reinhart — mostly works with trained actors, she says she can spot star power anywhere.

“I could be sitting

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