The Vamps Sister Birthday Card The Vamps have become one of the most popular bands around. With over 2.5 million fans on Twitter alone, the popularity of this British pop band shows no sign of slowing down. The message reads "Sister, its your birthday. Hope your day rocks!Happy Birthday." There is lots of space to write your personal message as well. Order your Vamps Sister Birthday card before 2pm Monday to Friday and receive delivery. Worldwide delivery is also available.