Sienna Miller, 44, and her boyfriend, actor Oli Green, 30, made a striking appearance at the inaugural Airbnb.org gala in Los Angeles on Wednesday. Miller captivated attendees in an elegant, draped off-white gown that featured cinched waist detailing.

The actress styled her blonde hair loose and paired the ensemble with heels, keeping her accessories minimal. Green complemented her look in a sharp black suit with an open white shirt. The couple, who are raising two children together and recently became engaged, appeared affectionate on the red carpet at Milk Studios.

The actress, 44, looked nothing short of sensational in the elegant number as she cosied up to the dapper actor, 30

The event marked the first-ever gala for Airbnb.org, a nonprofit organization dedicated to providing free emergency housing for individuals and families affected by crises such as natural disasters and illnesses. This initiative operates separately from its for-profit counterpart, Airbnb.

The event marked Airbnb.org's first-ever gala. Unlike its for-profit sibling company, Airbnb.org is a nonprofit that offers free emergency housing to those devastated by natural disasters, illness or other crises

Miller and Green's appearance at the gala follows recent personal milestones for the couple. Last week, Miller celebrated Green's 30th birthday on Instagram, sharing several intimate photos. She referred to him as the "best daddy," "best son," and "best big brother," and also posted a picture showcasing her engagement ring.

Miller previously shared details about Green's proposal on "The Tonight Show Starring Jimmy Fallon." She revealed that Green proposed in Central Park shortly after the birth of their second child. The proposal occurred on May 14, approximately three weeks after she gave birth. Miller recounted being caught off guard by the proposal, noting her "full postpartum beauty" at the time.

The couple, who welcomed a son in April and a daughter in January 2024, first met seven years ago at a Halloween party. They reconnected at the same event years later, leading to their romantic relationship.