Jess and her twin brother Matt are planning their birthday - but they can't agree on what sort of party to have. Finally they settle on a disco, but Jess isn't too keen on all Matt's friends coming He's asked the whole class, so she feels she should do the same - even if that includes school boff, Becky. The only problem is, now Becky thinks Jess is her new best friend. When Jess goes shopping for an outfit for the party with her friends, they bump...