CHRIS TUCKER is totally excited about the possibility of doing a fourth "Rush Hour" movie with JACKIE CHAN . . . even though nothing is in the works yet.

He says, quote, "It's going to be a lot of fun.  I hope it happens.  We need to do one more.  I just want us to be free and do our thing.  I love working with Jackie, being around Jackie.  Stuff just happens when we're together."

Actually, that's pretty much the ONLY time "stuff happens" in Chris' movie career.  He's only done FOUR movies in the past 14 years:  The three "Rush Hour" ones, and a new movie called "Silver Linings Playbook", which hit theaters last week.