Top movies at North American box office

LOS ANGELES, May 18 (Reuters) - Following are the top 10 films at the North American box office for the three-day weekend beginning on May 16, led by the new release "The Chronicles of Narnia: Prince Caspian," according to studio estimates compiled on Sunday by Reuters.

1 (*) Prince Caspian .. $ 56.6 million

2 (1) Iron Man ........ $ 31.2 million

3 (2) What Happens in Vegas .......... $ 13.8 million

4 (3) Speed Racer ..... $ 7.6 million

5 (5) Baby Mama ....... $ 4.6 million

6 (4) Made of Honor ... $ 4.5 million

7 (6) Forgetting Sarah Marshall ...... $ 2.5 million

8 (7) Harold & Kumar