<H4>Piece of me en iTunes</H4>

USA: #15 (+5);
Ireland: #3 (+1);
Canada: #7 (=);
Sweden: #10 (=);
Australia: #12 (+5);
New Zealand: #14;
Finland: #17 (=);
Norway: #28 (=);
Germany: #43 (+8);
UK: #44 (+1);
Switzerland: #47 (+9);
Austria: #59 (+15);
Denmark: #70 (+4);
Italia: #73 (+2);
France: #98 (debut).