ASHLEY ON BOARD: Donna Karan is about to make” Twilight” star Ashley Greene’s dreams come true. The actress, who originally aspired to a career as a model, has been signed to a one-year agreement to represent DKNY and DKNY Jeans in their advertising campaigns and serve as the brands’ ambassador. She’ll make her first appearance in the spring 2012 global ad campaign now being shot by Inez van Lamsweerde and Vinoodh Matadin, but it will hardly be her debut in the designer’s clothes. Greene wore a Donna Karan custom gown to the 2011 Costume Institute gala and sported DKNY at Super Saturday in the Hamptons this past July. Patti Cohen, executive vice president for global marketing and communications at Donna Karan International, described Greene as “on the forefront of what it means to connect with a global fan base through social media, a focus that is aligned with our digital and new media initiatives.” Online and off, Greene’s going to be doing plenty of connecting — she’s scheduled to appear in five new films, stretching into 2013, including parts 1 and 2 of The Twilight Saga: Breaking Dawn.