|Robert Pattinson and Kristen Stewart (Getty Images)|
The pair – who played Hermione Granger and Ron Weasley in the wizard franchise – topped the list compiled by Forbes after banking $4.2 billion between them at the global box office in four movies in the series in the last five years.
'Twilight' actors Robert Pattinson and Kristen Stewart – who are dating each other in real life – came second after they picked up $2.5 billion from their portrayals of vampire Edward Cullen and human Bella Swan respectively in the saga.
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Shia LaBeouf and Megan Fox earned $1.5 billion after they starred as onscreen lovers Sam Witwicky and Mikaela Banes in 'Transformers' and 'Transformers: Revenge of the Fallen', which narrowly beat the actor's onscreen romance with Rosie Huntington-Whiteley in 'Transformers: Dark of the Moon', which pulled in $1.1 billion.
Robert Downey Jr. and Gwyneth Paltrow's portrayals of Tony Stark and Pepper Potts in the 'Iron Man' films saw them claim fourth with $1.2 billion.
Among the other stars who made up the list were Johnny Depp and Penelope Cruz, who earned $1 billion for 'Pirates of the Caribbean: On Stranger Tides', ahead of Orlando Bloom and Keira Knightley's $963 million for their romance in the first three movies of the series.
Forbes list of Hollywood's Top Earning On-Screen Couples:
1. Emma Watson and Rupert Grint, $4.2 billion, 'Harry Potter'
2. Robert Pattinson and Kristen Stewart, $ 2.5 billion, 'Twilight'
3. Shia LaBeouf and Megan Fox, $1.5 billion, 'Transformers'
4. Robert Downey Jr. and Gwyneth Paltrow, $1.2 billion, 'Iron Man'
5. Shia LaBeouf and Rosie Huntington-Whiteley, 'Transformers: Dark of the Moon'
6. Johnny Depp and Penelope Cruz $1 billion, 'Pirates of the Caribbean'
7. Orlando Bloom and Keira Knightley $963 million, 'Pirates of the Caribbean'
8. Tobey Maguire and Kirsten Dunst, $890 million, 'Spider-Man'
9. Leonardo DiCaprio and Marion Cotillard, $825 million, 'Inception'
10. Sarah Jessica Parker and Chris Noth, $703 million, 'Sex in the City'