 On February 4 , 2008 , " Piece of Me " debuted at the Australian Singles Chart at number two . The song has shipped over 70 @,@ 000 copies in Australia , earning a platinum certification by the Australian Recording Industry Association ( ARIA ) . In New Zealand , the song debuted at number thirty @-@ four on December 31 , 2007 . It was certified gold by the Recording Industry Association of New Zealand ( RIANZ ) for sales over 7 @,@ 500 copies . In the United Kingdom , " Piece of Me " debuted at number sixty @-@ nine on the UK Singles Chart on December 23 , 2007 ( for the week ending December 29 , 2007 ) . After its physical release , the track peaked at number two on January 13 , 2008 ( for the week ending date January 19 , 2008 ) . According to The Official Charts Company , the song has sold 250 @,@ 000 copies there . In Ireland , the song debuted at number twenty @-@ seven on the Irish Singles Chart December 20 , 2007 . On January 10 , 2008 , it peaked at number one and stayed in the position for two weeks . " Piece of Me " achieved similar success through Europe , peaking inside the top ten in the European Hot 100 Singles chart , Austria , Denmark , Finland and Sweden and reaching the top forty in Belgium ( Flanders and Wallonia ) , Czech Republic , Italy and the Netherlands . 
