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 heels.

WHY WE LOVE IT Who needs two sleeves? Kate Beckinsale's sexy asymmetrical LBD proved that sometimes less really is more!

CELEBRITY: Kate Beckinsale

DESIGNER: Elie Saab

TREND: Black

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Kate Beckinsale

Kate Beckinsale chatted with Jay Leno in a sexy LBD

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