Renee Zellweger and Bradley Cooper have ended their courtship after nearly two years, sources told UsMagazine.com Friday.

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The couple met on the set of the film "Case 39" six years ago, but didn't begin dating until 2009.

The celebrity news Web site said representatives for the stars declined to comment on its breakup report Friday.

Cooper is best known for his work in "The Hangover" and "The A-Team," and Zellweger's film credits include "Jerry Maguire," "Bridget Jones's Diary," "Chicago" and "Cold Mountain" -- for which she won a supporting actress Oscar.