Los Angeles, Jan 25 (Agencies): Natalie Portman's latest release ‘No String Attached’ boosted her career by claiming the top position at the US box office.

The 29-year-old has claimed the top spot at the box office with the film co-starring Ashton Kutcher. The movie earned an estimated USD 20.3 million on its opening weekend, reported Variety online.

The domestic takings almost equal the film's production budget of USD 25 million and means the actress has two films in the top ten.

Her movie 'Black Swan' is still in sixth place in the box office chart, and has grossed USD 83 million at the domestic box office.

'No Strings Attached' follows two friends, played by Kutcher and Portman, who try to maintain a purely sexual relationship with each other, even though they are falling in love.

According to previous media reports, the winner of Golden Globe Award and Constellation Award, who feels more Jewish and that she would like to raise her children in the Jewish religion, had decided to take a break from acting to bring up her soon-to-be born baby.