Mary-Kate and Ashley Olsen are expanding their fashion reach.

The sisters, entertainers and marketers almost since their infancy who last week became members of the Council of Fashion Designers of America, have signed a deal with J.C. Penney Co. Inc. to launch Olsenboye, a junior brand that will be exclusive to the chain.

The collection will have a major rollout, set for 600 Penney’s stores in February. But the company aims to generate curiosity among teens well before the launch with what amounts to a new marketing approach for the retailer built around previews, limited offerings and digital, guerrilla and viral marketing tactics.

The effort kicks off Monday with an Olsenboye truck cruising around New York selling merchandise and giving out cupcakes, balloons and pins, and empty racks in 50 high-profile stores will be covered in Olsenboye shrouds. Beginning Nov. 6, Olsenboye will be available on jcp.com and in those 50 stores, including the Manhattan flagship, for a limited time. MORE

Check out a few of their designs below! What do you think?