The song peaked at number 2 on the U.S. Billboard Hot 100 , becoming her first Top 5 single ; it also peaked at number 1 in New Zealand , number 2 in the UK and at number 6 and number 7 in Australia and Canada , respectively . It peaked at number two on the U.S. Billboard Hot 100 , becoming her first top five single . It also peaked at number-one in New Zealand , number two in the United Kingdom and at number six and number seven in Australia and Canada , respectively .