The Cheeky Girls

The Cheeky Girls are a pop duo consisting of twin sisters Gabriela and Monica Irimia, from Cluj-Napoca in Transylvania, Romania, but based in Britain. After appearing as auditionees in Popstars: The Rivals, they achieved success in the charts with four top ten hits between 2002 and 2004. They are best known for their debut single, "Cheeky Song (Touch My Bum)", which has sold more than 1.2 million copies worldwide.

source: Wikipedia