'Iron Man' holds onto Aussie top spot

Robert Downey Jr's superhero film Iron Man has held onto the Australian box office top spot.

The action movie beats off competition from Ashton Kutcher's comedy vehicle What Happens In Vegas, which lands at two.

Real-life war story Die Fälscher is the only other new entry at number seven, while Amy Adams's rom-com Miss Pettigrew Lives for a Day moves up 12 places to number six.

The top ten in full:

1. (1) Iron Man - $3,181,164
2. (-) What Happens in Vegas - $2,298,783
3. (2) Made of Honour - $911,877
4 (3) Forgetting Sarah Marshall - $334,820
5. (4) The Painted Veil - $277,017
6. (18) Miss Pettigrew Lives for a Day - $247,659
7. (-) Die Fälscher (The Counterfeiters) - $152,240
8. (6) Deception - $125,071
9. (5) Street Kings - $123,458
10. (7) Nim's Island - $109,442