Once: Nivea - Win 2 VIP Tickets To Meet Katy Perry & 2 Prizes Per Day For 2 Months (iPods Etc)
Then enter your details on the site, along with your NIVEA barcodes.
(It also says to keep your reciept so if you win you can show them)
You can win 2 tickets to meet Katy Perry, plus they are also giving away two prizes every day for two months. Prizes include - ipods shuffles, ipod nanos, ipod touches, and Katy Perry Cds.