Cedric Diggory new
With work starting on the next Potter film, Newsround can exclusively reveal that the part of Cedric Diggory will be played by teenager Robert Pattinson.
The news was revealed by his acting agency. Robert, who is from London, is a strapping 6ft 1.
Like Cedric he's a highly skilled sportsman, taking part in everything from football and athletics to skiing and snowboarding.
But he's also reportedly an excellent musician playing guitar and keyboards.
Love rival
Goblet won't be his first film, he'll be appearing in the movie of Vanity Fair playing Rawdy Crawley and a German film called Kingdom In Twilight.
As well as stage roles in Macbeth, Anything Goes and Tess of the D'Urbevilles.
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In Goblet of Fire, as well as being Harry's love rival for Cho Chang, Hufflepuff hero Cedric also competes against Harry as the other Hogwarts' champion in The Triwizard Tournament.
Speculation
For months there has been a lot of speculation about who will play the part.
Since Newsround discovered he was playing the part, it's emerged that Robert's name had also been mentioned in connection with the part of Cedric on the "Chambers and Secrets" fan messageboard.
Filming is due to get underway fully in July, and the movie should be released in November 2005.