Rating: 4
Without a doubt, both Brits look fabulous – stolen shot or otherwise.
The battle of the LBDs goes to Beckinsale. Her puff sleeved frock with a cute hemline is more 2008 than Sienna’s drawstring number.
But Sienna has cuter footwear. Gladiator sandals are a better match for minidresses than stiff white pumps. Give those toes some breathing room.

