Ali Larter has the blues! The Heroes star and her husband, Hayes MacArthur, are expecting a baby boy, a source tells In Touch. "At first, they wanted to be surprised, but they just couldn't help themselves. They're thrilled!" a friend of the actress says. Ali has already started decorating the nursery, which will mostly be decked out in blue and white. "She is so excited about shopping for the new baby - she has been going overboard buying everything. Although she is only in the beginning stages of putting together the nursery, Ali definitely wants to keep everything eco-friendly and simple," the friend adds. And the blond beauty is obsessed with new discoveries Target and Baby Gap. "She couldn't believe how much baby stuff they carried!"