Supermodel Cheryl Tiegs, 52, is soon to be a supermom. She and her husband, yoga instructor Rod Stryker, are having twin boys, thanks to a surrogate mother, reports PEOPLE in the upcoming issue. A baby shower was held in Los Angeles yesterday at the home of TV producer Norman Lear and his wife, Lyn. The twins are due in July. Tiegs already has a son, Zach, 8, with ex Anthony Peck.