The episode starts off as Maddie and London saying that they both are going to have a birthday party they are so excited. While Maddie and London are jumping up and down, Maddie asks London when her birthday party is is. Maddie says that hers is on Saturday and London says that hers is on Saturday. Maddie stops jumping, and tells London to change the date.
Meanwhile, Zack is thinking of what to get Maddie for her birthday. Cody comes and has a perfect present for her, Zack tries to take the present but Cody doesn't let him. Cody and Zack go out and buy a present for Maddie from Zack but Zack never found anything. Zack ends up stealing the present that Cody bought, but when Maddie opens the present, the card says that Cody got the present not Zack, but Maddie stills hugs Zack because his present was actually going to get birthday.
Meanwhile, London is not having such a good time in her birthday because his dad and mom are separated, and they are on opposite sides of the hotel. London keeps running from one side to another, but gets tired and leaves. But when she comes back the security guard doesn't let her in, thinking that she is another one of those posers.
London goes to Maddie's birthday party. They end up making up, and also everyone else comes and cranks up the party. Maddie ends up having a great time on her Sweet 16, so does London. The episode ends on that.