By Clare Youell
CBBC Newsround at the Brixton Academy
Singer Avril Lavigne's just finished three sell-out gigs in London.
Newsround's website went along to the final gig to see if the teenage rock chick cuts it live.
There's never been so many Avril Lavigne look-alikes in one place.
Queuing up outside London's Brixton Academy, there's literally thousands of girls dressed in fishnet tops, cut-off pants, striped tights, ties, you name it.
Avril Lavigne's in town.