In January, Victoria Beckham stripped down for an Armani underwear ad campaign. Now, the former Posh Spice is up to her old, scantily-clad tricks, as she shows even more skin in a new advertisement for the brand.The singer and supposed fashion icon unveiled the following photo, as a 20-foot banner, at a Macy's in New York City earlier today. "It's an honor to have been selected by Mr. Armani