7th Heaven is pulling a Buffy the Vampire Slayer this February. No, the Camdens aren't going all demon-y on us; rather, they'll be breaking into song for a special musical episode airing on Valentine's Day. "It's going to be very 7th Heaven — conservative and old-fashioned," says exec producer Brenda Hampton, noting that Heaven's core couples will belt out classic tunes such as "Love Is Sweeping the Country," "You Were Meant for Me," and "You Are My Lucky Star." "We've been wanting to do one of these for a while now because a lot of the cast sing. We just could never quite get the idea or the music together for it."