Paul Drinkwater/NBC/NBCU Photo Bank
WHAT SHE WORE
The actress stepped onto the The Tonight Show with Jay Leno
stage in a knee-length Elie Saab
sheath, emerald Sutra earrings and sparkling Christian Louboutin
WHY WE LOVE IT
Who needs two sleeves? Kate Beckinsale
's sexy asymmetrical LBD proved that sometimes less really is more!