Girls Out Late by Jacqueline Wilson

Ellie has a boyfriend! And he's really, truly interested in her - not in her best friends, Magda and Nadine! She and oh-so-gorgeous Russell have so much in common - Ellie knows they're made for each other. If only Dad thought so too. While Ellie tries her best to cope with Dad's totally unreasonable curfew, Magda's dealing with her crush on a teacher - and Nadine's falling for slimy Liam again. What they need is a girls' night out - but they might get a little more than they bargained for.