The Valley star Zack Wickham is reacting to his costar Janet Caperna’s generous offer to serve as his surrogate. “I’ve never wanted to, like, say, ‘No, thank you,’ faster,” Zack exclusively told Us Weekly on Thursday, May 7. “Oh my god, could you imagine?” The reality TV star continued, “I just don’t even know what that would entail. I do think she was, you know, saying it in a joking manner. Because I think if I followed through with it, she’d …