Feeling like a third wheel in the Cupcake Club when best friend Emma goes away on a family trip, Alexis bonds with Katie while Mia spends time with a visitor, a situation that helps all the girls to discover the benefits of sharing friendships with multiple people.

"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...

Moving on with her Cupcake Club friends despite lingering resentment over being ditched by her former best friend for a more popular group, Katie resolves to confront Callie and struggles to find ways to repair the friendship.

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.

When Mia arrives at her new school, her goal is to be open to and friendly with everyone, but everyone at Park Street School fits into a clique. When the Popular Girls Club takes an interest in Mia's awesome fashion style and wants to recruit her, Mia must decide between them and her great new Cupcake Club friends. It's like choosing between her divorced mom and dad and her old house and new house. Is it always going to be Mia in the middle, or can...

All of Katie's friends in the Cupcake Club have outside interests, so Katie sets out to find an extracurricular activity, but when she makes the softball team, Katie realizes that team sports are harder than she expected.

Aspiring to win the science fair with a project that proves that cupcakes are good for you, Alexis finds her ambitions challenged by her crush's association with another girl and a cupcake order for a mean girl's sweet sixteen.

"Katie's mom asks Katie for a huge favor: will she spend some time with Emily, her boyfriend's daughter? Katie agrees and brings Emily to a Cupcake Club meeting. Things go well--almost too well. Everyone likes Emily so much, Katie wonders if her friends like Emily more than they like her! And if her mom marries Emily's dad, will Emily become her favorite daughter? Katie is an only child, so all this sibling stuff is new to her. She's starting from...

"Emma is playing ball with her brothers on an unusually warm winter afternoon. But an errant toss from her brother Matt hits her right on the nose! Luckily, it's nothing more serious than a little swelling, but it's enough to make her lose an important modeling job at The Special Day salon. Mona hires "mean girl" Olivia Allen to fill in. Olivia is thrilled, not only for the job, but also for a chance to spread some nasty rumors about Emma. Worst of...