The adventure sequel added approximately $35.6m in its second weekend and stands at $124m. Overall the top 12 films accounted for $169.2m, which represented an 18% rise over the same weekend last year.
Fox Searchlight's comedy Juno was pound-for-pound the biggest success story of the weekend as it climbed five places to fifth in its fourth weekend on $10.3m to stand at $25.7m.
Another Fox release, the action horror sequel Alien Vs. Predator: Requiem, opened in sixth place on $10.1m over three and $26.9m over five days. Sony's family feature The Water Horse: Legend Of The Deep launched in seventh on a middling $9.2m over three and $1.8m over five.
Buena Vista's Enchanted crossed $100m and ranks 10th on $110.7m after six. The Weinstein Company's awards hopeful The Great Debaters directed by Denzel Washington and released through MGM launched in 11th place on $6.3m over three and $13.5m over five.
Fox's Alvin And The Chipmunks switched places with Warner Bros' I Am Legend and added $30m for $142.2m after three weekends to rank second. I Am Legend ranks third and is poised to cross $200m after the same period of time following a $27.5m weekend haul that raised the tally to $194.6m.
Universal will be pleased with the progress of Charlie Wilson's War, which after two weekends ranks fourth on $34.5m. New Line's The Golden Compass has lacked direction throughout its North American run and ranks 12th on a poor $58.9m after four weekends.
Estimated Top 10 North America Dec 28-30, 2007
Film (Dist)/Int'l dist/Est wkd gross/Est total to date
1 (1) National Treasure: Book Of Secrets (Buena Vista) WDSMPI $35.6m $124m
2 (3) Alvin And The Chipmunks (Fox) Fox Int'l $30m $142.4m
3 (2) I Am Legend (Warner Bros) WBPI $27.5m $194.6m
4 (4) Charlie Wilson's War (Universal) UPI $11.8m $34.5m
5 (10) Juno (Fox Searchlight) Fox Int'l $10.3m $25.7m
6 (-) Alien Vs. Predator: Requiem (Fox) Fox Int'l $10.1m $26.9m
7 (-) The Water Horse: Legend Of The Deep (Sony) SPRI $9.2m $16.8m
8 (6) P.S. I Love You (Warner Bros) Summit International $9.1m $23.4m
9 (5) Sweeney Todd (DreamWorks-Paramount) WBPI $8m $26.7m
10 (7) Enchanted (Buena Vista) WDSMPI $6.5m $110.7m