"Katie is miserable when her best friend is invited to join the Popular Girls Club and Katie is left out. Is there an Unpopular Girls Club she can join? Luckily, Katie finds her way with a great new group of friends-Mia, Emma, and Alexis-and together they become the Cupcake Club. Sometimes starting from scratch turns out to be the icing on the cupcake"--

The girls in the Cupcake Club are ecstatic when Mia asks them to be junior bridesmaids in her mother's wedding and they find the perfect dress, but while trying to pay for the dress without the help of her parents, Emma must balance babysitting her brother, a dog-walking business, flute practice, and baking for the Cupcake Club.

Katie loves to make cupcakes, but all her friends in the Cupcake Club have other interests as well, so she tries her hand at various sports and eventually makes the softball team, only to find that competition makes her too nervous to play.

Already frustrated about having to babysit her younger brother, Emma is disgusted when she learns she will have to sit with him on the bus when they go to summer day camp and deal with his susceptibility to motion sickness.

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.

The Special Day wedding salon is running an ad in the local newspaper, and they want Emma to model in the advertisement. The ad is a huge hit and suddenly Emma is very much in demand. But after running all over New York City for auditions, Emma realizes being a model is a lot tougher than she thought. Does Emma really want to be America's next top model, or is being a part of the Cupcake Club sweet enough?

Emma's younger brother Jake has tonsillitis and makes life difficult for Emma, while the Cupcake Club girls are spoiling him with cupcakes and little gifts.

When Katie learns that her mother's new boyfriend is her math teacher, Jeff Green, Katie is accused of getting special treatment in class, and it's the Cupcake Club to the rescue to help Katie deal with the rumors and the changes in her life.

"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?"--Publisher's website.

"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...

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.

"Katie has a tough time keeping one secret...what happens when she has to keep four? All of the cupcake girls have secrets and are ready to burst! Katie loves knowing a secret; it's just tough for her to keep them! And in this story all her friends have told her a secret! From new crushes to someone cheating on a math test, Katie doesn't know what to do with all of this juicy information! Can the Cupcake Club survive with everyone keeping secrets...

When Emma's little brother Jake looks after the neighbor's dog in preparation for getting his own puppy, the pet goes missing and Emma and the rest of the girls have to find it before the owner comes home.

Worried about meeting her biological father, Katie is blindsided by the news that her mother's boyfriend intends to propose to her mom.

When Emma goes for a modeling gig, Katie tags along for support, but when the agency chooses to go with Katie instead, Emma finds herself jealous.