Can the new Fashion Club be the icing on the cupcake for Mia, or is she in over her headshot? When fashionista Mia hears someone is starting a Fashion Club at school, how can she resist? But can she manage to take part in two clubs at the same time? And what will her Cupcake Club friends think about this? Worst of all, Mia’s frenemy Olivia Allen wants to be in charge of the Fashion Club. Can Mia and Olivia make peace long enough to survive a fashion show?

Mia hears about someone at school starting a fashion club, and wonders if she can manage being in two clubs at the same time.

Mia learns to balance style and substance when she has to get glasses AND braces. Fashionista Mia gets some unflattering news from Katie’s mom, Dr. Brown: She needs braces. And just when Mia thinks things can’t get any worse...they do. Her teacher is concerned that Mia is squinting in class. A trip to the opthamologist confirms it: Mia needs glasses, too! Mia is miserable until her stylish mom comes to the rescue with a plan and a very chic middle school look. And her wonderful Cupcake Club friends reassure her that glasses and braces don’t get in the way of all they really see: the same old Mia.

Mia is excited to enter a Design-a-Dress contest, but she’s pressed for time. And when she tries to finish working on her dress during a Halloween cupcake party, it’s a recipe for disaster! When Mia reads about a Design-a-Dress contest in a magazine for “budding designers ages 12–16” she is excited. But she doesn’t realize how much work designing—and sewing—a dress truly is until she starts on her contest entry. While Mia stresses out about all the work she has to do, she and Katie have an argument about, of all things, fashion preferences! Katie offers suggestions that don’t really go with the outfit Mia has in mind. And when Mia makes (what she thinks) is an offhand joke about Katie’s fashion sense, it turns into a full-blown argument. As Mia tries to finish working on her dress during a kids’ Halloween cupcake party, she realizes that kids plus cupcakes plus silk dresses plus frosting equals a recipe for disaster!

Katie needs the help of her friends to cope with the changes of her mother getting a boyfriend and when she gets an e-mail from her dad saying that he wants to meet her.

Emma has a supersweet, superstar secret—but can she keep it from the Cupcake Club? Hollywood star Romaine Ford is back in town, and she needs cupcakes for her movie premiere...and her wedding! But everything is top-secret. Emma is asked to make the cupcakes, but she can’t tell the rest of the club who they are for! Romaine doesn’t want any paparazzi to ruin her wedding, and she feels the less people who know, the better. Can Emma fulfill this order without spilling the secret to her best friends?

Mia is being cyber-bullied, and she’s determined to find out who is responsible in the latest addition to the Cupcake Diaries series. Mia is upset when her parents tell her she’s too young to go to a concert without adult supervision. She’s old enough to help run a cupcake business! Why can’t her parents see that she’s also responsible enough to do whatever she wants? And just when she’s reached a compromise with her parents (her older brother Dan will go to the concert with her), Mia finds out she’s being cyber-bullied on social media. It’s the Cupcake Club to the rescue as they all help Mia solve her online bullying mystery!

Hired with the Cupcake Club to serve a huge order at a neighbor's outdoor party, Alex, knowing that her crush will be in attendance, struggles to find just the right outfit when she discovers that she has reached an in-between size.

The girls realize that it is great to have friends and they are a lot like cupcakes you can't have enough and they are good in all combinations.

After an errant throw from her brother ends up in a bruised, swelled nose for Emma, she loses her modeling job and thus, cannot afford the holiday gifts she intended to buy for her family and friends.