By Rianne Addo For Mailonline
Published: 15:32 BST, 22 September 2019 | Updated: 15:32 BST, 22 September 2019
She's no stranger to exuding glamour in chic ensembles, both on-camera and at high-profile events.
The Alfie actress, 37, caught the eye as she slipped into a structured velvet dress, embellished with leaf print sequins across the garment's neckline.
Taking her look up a notch, the screen star's outfit featured satin sleeves, tied in with quirky shoulder pads.
The American Sniper actress injected even more glamour into her appearance as she boosted her frame in a pair of silver ankle-strap heels with a thick platform, and rounded off her outfit with a pair of sheer interlocking-G tights by Gucci.
New York-born star Sienna accessorised her striking look with a pair of diamond dangle earrings, and toted her belongings in a mini briefcase-inspired handbag.
With her blonde locks styled into an elegant