The Web site movies.com polled its users and found movie fans cannot get enough of the romantic couple Jack and Rose, from the film "Titanic."

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The survey found movie fans chose Leonardo DiCaprio, who played Jack, and Kate Winslet, who played Rose, as the couple with the best on-screen chemistry.

Other film couples ranked at the top of the on-screen chemistry poll were: Zach Braff and Natalie Portman in "Garden State," Jude Law and Nicole Kidman in "Cold Mountain," Humphrey Bogart and Lauren Bacall in "Key Largo" and "The Big Sleep," and Cary Grant and Grace Kelly in "To Catch a Thief."

Movies.com users chose "Titanic" as the most romantic film of all time, followed by "Sleepless in Seattle,""Casablanca,""Gone with the Wind," and "When Harry Met Sally."