A week after news broke that George and Amal Clooney are expecting twins, the actor's mother has revealed the gender of the babies. "It will be one of each! Yes, a boy and a girl," she gushed to Vogue magazine last weekend, in comments printed for the first time on Thursday. "That's what I've been told How marvelous! My husband and I are extremely excited." Amal is reportedly due in June.