A.C. Slater is all grown up. Mario Lopez is going to be a father. People’s 2008 Bachelor of the Year and his girlfriend, 28-year-old actress Courtney Mazza, are expecting a baby in the fall. The pair met in 2008 when Lopez starred in A Chorus Line on Broadway. Lopez, 36, who became an icon of the 1990s on Saved by the Bell, is the host of Extra and MTV’s Best Dance Crew. "I'm really excited. I'm happy. I can't wait to be a dad," he told People magazine.