Sienna Miller, 42, Turns Heads In A Baggy Tan Pantsuit For ‘Marion’ Screening Without Her 27-Year-Old Boyfriend

Sienna Miller Rocks A Flattering Brown Pantsuit In New York City With Boho-Chic Jewelry

As for her glam, the Factory Girl star wore her signature blonde tresses down, parted in the center and styled into elegant loose waves. For her makeup look, Miller went for a more minimal look, with voluminous lashes, ample rosy blush and a pink pout, highlighting her natural beauty.

Miller (who also shares daughter Marlowe, 12, with ex Tom Sturridge) hosted the gathering at the Cinema by NeueHouse, attracting numerous celebrities. Miller came on board as the executive producer for Joe Weiland and Finn Constantine's short film, Marion.

This film portrays the life of Marion, the sole female bull-jumper in France. The role of Marion is played by Caroline Larbère, an actual French bull-jumper, who grapples with balancing her love for the sport and her identity as a woman. Weiland and Constantine drew their inspiration for the short film from Larbère's real-life experiences, Variety reports. 

According to the log line for the film Miller worked on: "The short tracks the tense fifteen minutes before her first performance in a packed French arena. As she prepares, being the only woman in the team, the film explores her battle against misogyny and prejudiced attitudes. A journey of one woman through an all-male world – juggling motherhood and the contentious pursuit of her passion."