'No Strings Attached' leads Aus box office

Ashton Kutcher and Natalie Portman's romantic comedy No Strings Attached has topped the Australian box office.

The movie, directed by Ivan Reitman, pulls in $2.2 million Down Under to cruise past 127 Hours and secure first spot on its debut weekend on release.

The King's Speech retains its place at number three, last week's number one Black Swan drops to four and Clint Eastwood's Hereafter completes the top five.

Elsewhere, the James Cameron-produced 3D survival thriller Sanctum is the biggest faller as it slides down five places to number seven.

The box office top ten in full (figures in Australian dollars):

1. (-) No Strings Attached - $2,217,421
2. (-) 127 Hours - $1,198,127
3. (3) The King's Speech - $1,197,664
4. (1) Black Swan - $1,176,922
5. (-) Hereafter - $1,017,222
6. (4) True Grit - $892,797
7. (2) Sanctum - $845,049
8. (5) The Green Hornet - $499,101
9. (6) The Next Three Days - $403,147
10. (7) The Fighter - $394,359