BEN STILLER's war comedy TROPIC THUNDER has retained its grip on the top of the US box office, after earning an impressive $11.5 million during its third week of release.

The comedy - which features Stiller, JACK BLACK, ROBERT DOWNEY JR. and TOM CRUISE - beat out new futuristic thriller, Babylon A.D. starring VIN DIESEL - which grossed $9.7 million in its first week of release, coming in second place.

The Dark Knight moved up a spot from last weekend, to number three, taking in an additional $8.75 million.

The Batman film now boasts total takings of $502.4 million in its four weeks - becoming the second movie in Hollywood history to top $500 million at the domestic box office.

Rounding out the top five is ANNA FARIS-starring comedy The House Bunny, coming in at number four with taking of $8.3 million.

DON CHEADLE-starring drama Traitor follows, taking in $7.9 million in its first week.


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