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Image: Emma Watson and Rupert Grint
Joel Ryan  /  AP
Emma Watson and Rupert Grint star as Hermione and Ron in the "Harry Potter" franchise, which is on track to top $7 billion in earnings.
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updated 1/25/2011 9:14:57 PM ET 2011-01-26T02:14:57

We all knew it was coming to this. After watching them grow from 10-year-old tykes to brave teens, romance has finally, truly bloomed in the "Harry Potter" movies. No, Hermione and Ron haven't kissed yet, but "Harry Potter and the Deathly Hallows" made it clear that the pair has deep feelings for each other and a kiss can't be far behind.

Which is why Rupert Grint and Emma Watson top our list of Hollywood's Top Grossing On-Screen Couples. The "Harry Potter" movies, in which the pair star as Ron and Hermione, have earned a whopping $6.3 billion so far. And with a final film slated for next summer ("Harry Potter and the Deathly Hallows: Part 2") the franchise is on track to top $7 billion.

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Forbes slideshow: Top 10 on-screen couples

In Old Hollywood, couples like Spencer Tracy and Katharine Hepburn, and Humphrey Bogart and Lauren Bacall, used to appear in multiple films together. These days, you pretty much only get on-screen couples appearing together in several films when they are attached to a franchise.

There are exceptions. Leonardo DiCaprio and Kate Winslet starred together in the second-highest-grossing film of all time: "Titanic." Then in 2008 they reunited to play a doomed suburban couple in the film "Revolutionary Road." Thanks to those two movies, the couple ranks fourth on our list with $1.9 billion. (Of that total, "Titanic" earned $1.84 billion.)

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To formulate our list, we looked at couples who had appeared on screen together more than once in the last 10 years. We then added up the global box office for all of the films they starred in together. We did not include animated movies.

Ranking second behind Grint and Watson are Viggo Mortensen and Liv Tyler in the "Lord of the Rings" movies. Their romance provided a little something for the ladies who might have gotten bored watching a group of male hobbits carry a ring to Mordor. The franchise earned a total $3 billion at the global box office.

Forbes slideshow: The top-earning movies of 2010

Close behind are Orlando Bloom and Keira Knightley in the "Pirates of the Caribbean" movies. While Johnny Depp staggered around as Captain Jack Sparrow, the couple made googly eyes at each other and provided an emotional heart for the first three movies. The franchise has so far earned $2.7 billion.

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But evidently their romance was seen as superfluous compared with Depp and the series' great special effects: They've been cut out of the fourth movie. Instead look for Jack Sparrow to have some kind of romance with Penelope Cruz's Angelica in "Pirates of the Caribbean: On Stranger Tides," which hits theaters this summer.

Forbes slideshow: 10 stars to watch in 2011

Rounding out the top five are Robert Pattinson and Kristen Stewart in the "Twilight" movies. While romance might take a backseat to action in many of the movies on our list, it's the driving force in the "Twilight" films. It doesn't hurt that Pattinson and Stewart are also a couple in real life. So far the movies have earned $1.8 billion at the global box office. The last book, "Breaking Dawn," has been divided into two movies. The first will hit theaters this coming November.

© 2012 Forbes.com

Photos:

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  1. Harry and Voldemort

    Harry Potter (Daniel Radcliffe) meets his nemesis, Lord Voldemort (Ralph Fiennes), in part one of "Harry Potter and the Deathly Hallows." The film was originally going to be converted for release in 3-D, but Warner Brothers announced in October that they "were unable to convert the film in its entirety and meet the highest standards of quality." (Warner Bros.) Back to slideshow navigation
  2. Flying high

    Hagrid takes Harry on the flying motorcycle he inherited from Sirius, but Death Eaters don't intend to let the ride be a calm one. (Warner Bros.) Back to slideshow navigation
  3. Legion of doom

    Voldemort and his evil followers, including Bellatrix Lestrange, prepare for battle. (Warner Bros.) Back to slideshow navigation
  4. Ron Weasley

    Ron (played by Rupert Grint), Hermione and Harry drop out of school to find and destroy Voldemort's Horcruxes. Ron uses the Sword of Gryffindor to help in this mission. (Warner Bros.) Back to slideshow navigation
  5. New friend

    Harry rescues a mistreated dragon from cruel treatment by the goblins who own Gringotts Bank. Naturally, it comes in handy to have a thankful dragon on your side. (Warner Bros.) Back to slideshow navigation
  6. Casting a spell

    Hernione uses magic to protect the three friends from the sight of other wizards and Muggles. (Warner Bros.) Back to slideshow navigation
  7. Hogwarts in trouble

    In the Battle of Hogwarts, students fight to save their magical school from the Death Eaters. (Warner Bros.) Back to slideshow navigation
  8. Harry in trouble

    Is this the end for Harry Potter? Well, kind of, but there's still one movie to go after this. (Warner Bros.) Back to slideshow navigation
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  1. Warner Bros.
    Above: Slideshow (8) 'Harry Potter and the Deathly Hollows," part 1
  2. Summit Entertainment
    Slideshow (53) ‘Twilight’ stars light up Hollywood