Chivalrous Ben Affleck Shares His Coat With Co-Star Sienna Miller on Chilly Red Carpet -- See the Sweet Pics!

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Who says chivalry is dead?
Sienna Miller hit the Live By Night red carpet on Wednesday in London, England, wearing a lovely black and cream-colored Lanvin gown, but inevitably got cold while posing in the 50-degree weather. Her co-star, Ben Affleck, came to her rescue and loaned her his black overcoat while she chatted with the press. Meanwhile, Affleck made do with his navy blue suit jacket.
Photo: Getty Images
Photo: Getty Images
Live By Night, which debuts in theaters on Friday, is set in the Prohibition Era and centers around a group of individuals and their dealings in the world of organized crime.
Photo: Getty Images
Photo: Getty Images
Miller, 35, appears very comfortable with Affleck, 44, on the red carpet, but admitted to ET that she got a little star struck at Sunday's Golden Globes when she found herself chatting with her co-star and his A-list actor friends. “I found myself backstage in a kind of semi-huddle with Brad Pitt, Ben Affleck, and Jon Hamm, which was quite surreal. It was exciting,” she gushed. "I have a mental photo that I will hold onto!”