Sienna Miller opened up about working with the late Chadwick Boseman on 21 Bridges, sharing his extremely kind gesture that she couldn’t believe.“He produced 21 Bridges and had been really active in trying to get me to do it. He was a fan of my work, which was thrilling, because it was reciprocated from me to him, tenfold,” Miller, 38, told Empire magazine in a profile published on Monday, September 28.