How To Train Your Dragon remains at the top of the U.S. box office having grossed a further $15 million.
The latest project from Dreamworks has enjoyed success globally and has already grossed $355 million worldwide.
Jennifer Lopez returned to the big screen this week with her new movie The Back Up Plan, which entered the chart at number two.
Lopez takes on the role of Zoe, a woman who conceives twins through artificial insemination, only to meet the man of her dreams on the very same day.
Date Night held onto third spot for the second week while there was another new entry at number four.
The Losers is based on a graphic novel and brings together a cast of Jeffrey Dean Morgan, Zoe Saldana, Chris Evans, Idris Elba and Columbus Short.
Matthew Vaughn's comic book movie Kick Ass fell three places from last week's two to round off the top five.
There was a one place drop for Clash of the Titans, which ended the week at six, while Death At A Funeral fell three places to number seven.
Oceans was a third and final new entry at number eight.
1. How To Train Your Dragon - $15,025,000
2. The Back-Up Plan - $12,250,000
3. Date Night - $10,600,000
4. The Losers - $9,605,000
5. Kick-Ass - $9,500,000
6. Clash Of The Titans - $9,000,000
7. Death at a Funeral (2010) - $8,000,000
8. Oceans - $6,000,000
9. The Last Song - $3,700,000
10. Alice In Wonderland (2010) - $2,200,000
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