Sienna Miller's Big Ring Is on Display at Sundance 2020!

Sienna Miller has been the subject of engagement rumors lately and her big diamond ring was on display at the 2020 Sundance Film Festival!

The 38-year-old actress was joined by co-star Diego Luna while premiering their movie Wander Darkly on Saturday afternoon (January 25) in Park City, Utah.

Sienna and Diego were also joined by co-star Aimee Carrero and writer/director Tara Miele.

On Friday, the stars had a busy day of press while making stops at The IMDb Studio at the Acura Festival Village, the Los Angeles Times Live studio presented by Chase Sapphire, TheWrap Studio sponsored by Heineken, and the WarnerMedia Lodge: Elevating Storytelling with AT&T.

Sienna and her boyfriend Lucas Zwirner are rumored to be engaged, but nothing has yet been confirmed. Check out her ring in the gallery!