WHAT SHE WORE
A fitted Zac Posen
sheath, Irit diamond earrings and black patent Sergio Rossi
Outside the Late Show
studios in New York City WHY WE LOVE IT Willis
channeled Mad Men
-era sex appeal in a sophisticated little white dress with cutouts at the shoulders. If you don't have Rumer's perfect figure, choose a design with an empire waist
and fuller skirtyou'll still get all the benefits of playing peekaboo without feeling on display.