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.

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.

When Alexis decides she wants to be more like her popular older sister, Dylan, she tries out for cheerleading, without really thinking about what that entails, including that her sister was a star on her cheerleading squad.

"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.

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

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.

"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...

Emma's younger brother Jake has tonsilitis 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.

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.