WHAT SHE WORE:Jessica Alba in black and white cocktail dress and black satin pumps with a bow

WHO: Jessica Alba at the launch of Windows Phone 8 on October 29th 2012
WHAT SHE WORE: black and white Oscar de la Renta coocktail dress and black satin sandals with a bow from Christian Louboutin
BUY: Christian Louboutin Vampanodo 100 satin and suede sandals