Sienna Miller as Baroness in G.I. Joe: The Rise of Cobra

Sienna Miller portrayed the iconic, leather-clad villain Baroness (Anastasia DeCobray) in the 2009 live-action film G.I. Joe: The Rise of Cobra. Her character serves as a central antagonist and the sister of Cobra Commander, driven by a tragic past involving her former fiancé, Duke.

She wore a form-fitting, black leather corset jumpsuit engineered by continuous leather straps and tactical belts, echoing the classic 1980s animated design.

Miller underwent a major physical transformation, moving away from her signature blonde look to wear a long, sleek raven-black wig and the character's signature horn-rimmed glasses.

The Sequel Absence:

Despite her prominent role, Miller did not return for the 2013 sequel, G.I. Joe: Retaliation. Her character's absence was briefly explained away, and the female lead focus shifted to Adrianne Palicki's Lady Jaye.

Behind the Scenes:

Miller later shared in interviews that while the rigorous training and tight leather costumes were physically grueling, she thoroughly enjoyed stepping out of her traditional indie-drama roles to play a massive, campy blockbuster villain.