Caz isn't too keen on her dad's girlfriend at the best of times, so she's not sure how to react when she finds out that her dad's getting married again - and that she's expected to be a bridesmaid! But, as always, her friends manage to cheer her up - after all, it will be an excuse to dress up and look great! Then Caz discovers that the dress her dad's girlfriend wants her to wear is a nightmare... and that her worst enemy Melissa is planning to sneak into the wedding too. Can things get any worse? Caz will need all her friends' support and creativity to get her through the big day...