Leonardo DiCaprio and Kate Winslet's doomed relationship in 1997 film Titanic has earned them the title of most romantic onscreen couple of all time.

More than 500,000 people were polled for the ABC TV and People magazine movie rundown, and the stars earned almost a quarter of the votes for their turn in James Cameron's epic.

The romance between Clark Gable and Vivien Leigh in 1939 classic Gone with the Wind was rated the second most romantic film pairing, while Richard Gere and Julia Roberts' unlikely coupling in Pretty Woman landed them third in the survey.

Casablanca couple Humphrey Bogart and Ingrid Bergman came fourth, while Spencer Tracey and Katharine Hepburn - who starred in nine films together - rounded out the top five.