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around," Dan Fellman, president of domestic distribution for Warner Bros. which distributes the film, says. "We were up 32% on Saturday, which is a big jump for an adult movie. People really liked it."

"Unknown" 's win comes as a surprise since DreamWorks and Touchstone's "I Am Number Four" was expected to top the chart. The teen sci-fi film opens with an estimated $19.5 million, which falls short from analysts' expectations of $23 million, despite an advertising blitz designed to make it a "Twilight" for boys.

Still, Disney worldwide president of distribution, Chuck Viane, could see it positively. "It was an extremely competitive weekend, and we still have two days [Sunday and Monday] to see how all the films play out," he says of the movie which lures younger moviegoers with 68% of the audience between the ages of 12 and 34.

"Gnomeo and Juliet" stays on number three with an estimated $19.4 million or dropping just 23.5% from last weekend's haul. "Just Go with It" which topped the chart last week is now on the fourth with an approximately $18.2 million. Rounding up the top five is another newcomer "Big Mommas: Like Father, Like Son" with an estimated $17 million gross.

Top Ten Movies at Box Office for February 18-20:

1. "Unknown" - $21.8 million
2. "I Am Number Four" - $19.5 million
3. "Gnomeo and Juliet" - $19.4 million
4. "Just Go with It" - $18.2 million
5. "Big Mommas: Like Father, Like Son" - $17 million
6. "Justin Bieber: Never Say Never" - $13.6 million
7. "The King's Speech" - $6.6 million
8. "The Roommate" - $4.1 million
9. "The Eagle" - $3.6 million
10. "No Strings Attached" - $3.1 million