After total humiliation at her thirteenth birthday party, Jenna Rink wants to just hide until she's thirty. Thanks to some wishing dust, Jenna's prayer has been answered. With a knockout body, a dream apartment, a fabulous wardrobe, an athlete boyfriend, a dream job, and superstar friends, this can't be a better life. Unfortunetly, Jenna realizes that this is not what she wanted. The only one that she needs is her childhood best friend, Matt, a boy that she thought destroyed her party. But when she finds him, he's a grown up, and not the same person that she knew.

In Manhattan, the lawyer Liv and the school teacher Emma have been best friends since their childhood. They both are proposed to by their boyfriends on the same day and they plan their wedding parties in Plaza Hotel, using the services of the famous Marion St. Claire. However, due to Marion's secretary's mistake, their weddings are scheduled for the same day. None of them agrees to change the date and they become enemies, trying to sabotage the wedding party of the rival.