Wow, the advertisment is out! Here are some news article related to the product.

The new Giorgio Armani Diamonds for Men campaign, shot by Mario Testino, stars Josh Hartnett. It’s supposed to look like a real paparazzi shot, and Giorgio’s trying to play on the saying, “Diamonds are a girl’s best friend.” So then the paps are Josh’s BFFs?
Source: NY Fashion

The perfume Emporio Armani Diamonds for Men arrives on the market in August 2008. Its bottle was designed by Giorgio Armani himself, and it has a square-shaped bottle like a square-cut diamond. Name of the perfume and shape of the bottle is a real challenge for producers, designers and market, since diamonds are always attributed to women, as if they belonged only to them.
EA Diamonds for Men was created Jacques Cavallier of Firmenich. It contains gourmet-woody aromatic juicy, with an unusual gourmet reversal in the top notes. The perfume opens with sparkling, sweet aromas of bergamot, with Guaiac, vetiver, cedar, Szechuan pepper, cocoa and ambroxan.
The face of the commercial is Josh Hartnett, as mentioned above, the director of the video project is David Slade, while Mario Testino was in charge of the printed version of the commercial.
The perfume will be on the market in the amount of 30, 50 and 75ml EDT, as 75 ml aftershave, 200 ml bath and 75 ml deo stick.
Source: Fragrantica

Now here is the print advertisement, shot by Mario Testino. Mario Testino has photographed Josh before for a spread in Vman and Vogue. The video commerical will be done by David Slade, who is the director of 30 Days of Night.