 The pair played Senator Padme Amidala and Anakin Skywalker
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Star Wars couple Natalie Portman and Hayden Christensen have been voted as having the least plausible on-screen chemistry by film fans.
The pair beat Ben Affleck and Jennifer Lopez for their performance in Gigli into second place, which was made when they were a real life couple.
Former duo Tom Cruise and Nicole Kidman also made the list with Eyes Wide Shut.
British pairing Keira Knightley and Orlando Bloom were thought "too stiff upper lip" in Pirates of the Caribbean.
The 3,000 movie-goers who were surveyed for Pearl and Dean said their screen relationship was punctuated with too much old-fashioned romance and "not enough lust".
LEAST CONVINCING SCREEN PARTNERSHIPS
Catherine Zeta Jones and Sir Sean Connery's performance opposite one another in 1999's Entrapment landed in fifth place.
There was a 39-year age difference between the couple.
Affleck landed inside the top 10 for a second time, with his chemistry with Kate Beckinsdale in Pearl Harbor failing to convince audiences.
Hugh Grant and Andie MacDowell's relationship in romantic comedy Four Weddings and A Funeral finished sixth in the list.
The gay romance between Heath Ledger and Jake Gyllenhaal in Brokeback Mountain was more convincing, with only 5% of respondents saying it failed to win them over.
Madonna also featured highly in the poll, with her dramatic relationship with Italian actor Adriano Giannini in Swept Away not managing to draw in viewers.
The pop star made the 2002 film with director husband Guy Richie, with the release proving to be a box office flop.