Shelley Hennig (ex-Stephanie, DAYS) co-stars in MTV's new series, ZACH STONE IS GONNA BE FAMOUS, which premieres tonight at 10:30 p.m EST. "I'll be on for the next 4 weeks," she says. "I've been excited for 'Christy Ackerman' to make her debut. We all knew this girl in high school. Enjoy!"