You down with AoP? No? Well, here's what you need to know about it. Billie (Jenna Elfman) is pregnant, knocked up by a much younger guy, Zack, who now lives with her. She has a prudish younger sister, Abby, and a hard-drinking Scottish best friend, Olivia. Zack has a stoner best friend Davis. Hilarity ensues. Get it? Got it? Good. Because tonight, there are Developments. Or, at the very least, Shenanigans. And a guest star!