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.

Emma loses a modeling assignment—to Katie!—in the latest addition to the Cupcake Diaries series. When Emma goes on an audition for a new modeling job, Katie tags along to keep her company. But as it turns out, everyone wants Katie to model instead of Emma! At first Emma is happy for her friend. Soon though, she realizes sharing the spotlight isn’t much fun, even if it is with your BFF! Will the Cupcake girls continue to bicker amongst themselves or will they finally realize there’s just one person you need to please—yourself?

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.

Mia learns that you have to make your own luck—rather than rely on fun trinkets—in the latest addition to the Cupcake Diaries series. Mia is having a truly terrible week. So far she’s failed a pop quiz, ruined a batch of cupcakes, and even dropped some icing on her favorite shirt! But her cousins from Puerto Rico are coming to visit, so Mia has something to look forward to—and they even bring her a little lucky charm as a gift! When Mia’s luck immediately turns around, she’s convinced that her lucky charm really does have magic powers. But what will she do when her bad luck returns?

Mia goes on vacation and meets up with the girls from the Sprinkle Sundays series in the latest addition to the Cupcake Diaries series! Things are slow at the cupcake shop this summer, and so when Mia’s dad invites her on a long weekend trip to meet some of his college friends, she jumps at the chance—especially when she hears they have daughters her age. It turns out the girls work in an ice cream shop. Not only does Mia end up making new friends—she comes back with a new invention for the Cupcake Girls: an ice-cream cone cupcake!

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!

Katie is about to burst when the rest of the Cupcake Club entrusts her with their secrets, but this group of best friends soon realizes that sharing and keeping secrets is what friends are for.