Mary-Margaret is one of the best friends of Maddie. She is also intelligent like Maddie and she is a good volleyball player. She is not very impressed with London, and sees her as an annoying spoiled brat. However, she sometimes bonds with London because of her money, a fact that Mary Margaret does not deny, and an idea that London is fine with. She is shown to be sarcastic at times and a tough girl, even stepping on Maddie's spoiled brother's foot when he was rude to her. She is portrayed by Monique Coleman.