Britney Spears is releasing her new album on 2 December in the US
Singer Britney Spears has returned to the top of the Billboard Hot 100 chart for the first time since her debut single Baby One More Time, in 1999.
Womanizer, the first track off her new album Circus, was boosted by first-week download sales of 286,000.
Spears has scored the biggest opening-week tally by a female artist, beating Mariah Carey with Touch My Body.
Last October, top 10 single Gimme More jumped from 68 to number three, with first-week download sales of 179,000.
Despite a gap of almost 10 years between number one hits, the star has only had three other tracks in the US top 10.
Those records included Toxic, Oops!...I Did it Again and You Drive Me Crazy.
Her last album Blackout went to number two in 2007.
Circus is set to be released on 2 December, which also coincides with the star's 27th birthday.
After suffering a very public breakdown last year, which saw her lose custody of her children, Spears recently won three prizes at the MTV Video Music Awards.
Fans are hoping the new album is the start of a successful comeback.
Meanwhile, on Wednesday jury selection for the singer's court trial, for driving without a valid California licence, began.
However the singer exercised her right to stay away from court. Selection will continue on Thursday.