Tennis star Maria Sharapova and her cute white dog Dolce are starring in another campaign for the Canon Powershot cameras. As part of the promotion and in anticipation of the U.S. Open, Canon will be giving away five diamond-encrusted cameras in each color that the camera is offered in. Sharapova will debut the five diamond-covered Canon PowerShot Elph cameras during an invitation-only event at "Canon Center Court" on Aug. 20 at South Street Seaport. The cameras are worth around $12,000 each and the contest will run from August 20 to October 20 on the Powershot website.