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Iron Man 2 has debuted at the top of the US box office.

The Jon Favreau-directed blockbuster, starring Robert Downey Jr, has claimed $133.6 million in its first week in release.

The re-imagination of the horror classic A Nightmare On Elm Street slips to number two with $9.1 million, followed by the animated feature How To Train Your Dragon in third place with $6.7 million and Date Night taking the fourth slot with $5.3 million.

In its third week in release, Jennifer Lopez's The Back-Up Plan still has not managed to surpass its budget of $35 million. The rom-com has fallen to fifth place with $4.3 million.

Finally, debuting in tenth place this week is the the documentary Babies with $1.5 million.

The US box office top ten in full:
1. (-) Iron Man 2 - $133,600,000
2. (1) A Nightmare On Elm Street - $9,170,000
3. (2) How To Train Your Dragon - $6,760,000
4. (3) Date Night - $5,300,000
5. (4) The Back-Up Plan - $4,345,000
6. (5) Furry Vengeance -
7. (6) Clash Of The Titans - $2,305,000
8. (9) Death At A Funeral - $2,100,000
9. (6) The Losers - $1,800,000
10. (-) Babies - $1,575,000