The top movies at the North American box office

LOS ANGELES (Reuters) - Following are the top 10 films at the North American box office for the three-day weekend beginning on April 18, led by the new release "The Forbidden Kingdom," according to studio estimates compiled on Sunday by Reuters.

1 (*) The Forbidden Kingdom ............. $ 20.9 million

2 (*) Forgetting Sarah Marshall ......... $ 17.3 million

3 (1) Prom Night ........................ $ 9.1 million

4 (*) 88 Minutes ........................ $ 6.8 million

5 (4) Nim's Island ...................... $ 5.7 million

6 (3) 21 ................................ $ 5.5 million

7 (2) Street Kings ...................... $ 4.0 million

8 (6) Dr. Seuss' Horton Hears a Who! .... $ 3.5 million