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.

When Katie's best friend Callie leaves her for a clique called the Popular Girls Club on the first day of middle school, Katie decides to find a group that she can join.

"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.

"He loves me, he loves me not ... Alexis leaves a Valentine's Day surprise for her crush. Does he like her back? Despite objections from her Cupcake Club pals, Alexis makes a special valentine cupcake for her crush, Emma's older brother Matt, and leaves it for him next to his computer. Alexis is secretly hoping Matt will get the hint and give her a valentine, too. But ever since Alexis left the cupcake, Matt's been acting really uncomfortable around...

"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...

Reaching a compromise with her parents when they say she is too young to attend a concert alone, Mia discovers that she is being cyberbullied on social media and teams up with her fellow Cupcake Club members to discover who is behind the attacks.

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 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.

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.

Katie starts to realize that doing what you love always makes the batter sweeter.