 During its first week on U.S. radio , " Not Myself Tonight " became the most added song on Mainstream Top 40 ( 886 plays in its first six days ) and Rhythmic Radio stations in the United States , debuting at number 27 on the Mainstream Top 40 ( Pop Songs ) chart . Digitally , it sold 77 @,@ 000 copies in its first week , entering the Billboard Hot 100 chart at number 23 , becoming Aguilera 's third solo highest chart debut behind 2008 's " Keeps Gettin ' Better " , which debut at number 7 , and 2006 's " Ain 't No Other Man " , which opened at number 19 . The single became a success on the Hot Dance Club Songs , peaking atop the chart . As of March 2011 , " Not Myself Tonight " has sold 368 @,@ 000 copies in the US . The track managed to peak at number 11 and 12 on the Canadian Hot 100 and the UK Singles Chart , respectively . In Australia , " Not Myself Tonight " debuted and peaked at number 22 , remaining at its peak position for a further week . Meanwhile , in New Zealand , the single charted at number 32 on the New Zealand Singles Chart and managed to remain on the chart for only one week . The single fared better in South Korea , debuting at number 4 on the Gaon International Digital Chart . 
