Jackie Chan and Jet Li say they had so much fun making their first movie together they are planning a second one.

Kung fu cinema's two biggest stars expressed admiration for each other at a Hong Kong news conference Tuesday to promote their first collaboration, the $75 million Hollywood production, "The Forbidden Kingdom."

"The first day we started filming, it felt like we had worked together for many years," Chan said, adding, "after filming this movie, we didn't have enough fun."

"In four months (of filming), we went from friends to becoming brothers," Li said.

Chan said their fight sequences went so smoothly that cinematographer Peter Pau told them to slow down.

Chan and Li said they want to shoot another movie together based on a script they started working on 15 years ago, but both stars refused to give details.