The leading lady and star of the night was a vision in a white Yanina Couture creation that featured a deep-V neckline and billowing puffy sleeves with draped and layered chiffon. Her blonde locks were swept in a tousled updo that showed off her gorgeous chandelier Stephen Webster diamond earrings. Blunt, 35, completed the ethereal look with soft shimmering eyeshadow, a soft pink blush and peach lip.
ET spoke with Blunt on the red carpet where she reflected on her Mary Poppins experience, and if her daughters -- Hazel, 4, and Violet, 2-- have seen the movie.
"It’s very special. Very unique experience," Blunt expressed. "This is the first film that my daughter has seen, my older one has seen. My little one is probably too young. She's two, so she's like 'whatever.' But my older one saw it and loved it."