The 30-year-old English actress wore a black halterneck floor-length dress by BOSS Black with front and side slits in the skirt as well as the center neckline. This design was perfectly form-fitting and looked amazing on her; the high slits also gave a great view of Sienna’s platform blue sandals.
She completed her look with a metallic bronze clutch that matched her edgy jewelry by Pamela Love. Sienna wore her long blonde locks up in a high-volume style and rocked a cool cat-eye.
Sienna is expecting her first child with fiancé Tom Sturridge this spring!