Is Cooper, Zellweger relationship in trouble?

Los Angeles: Bradley Cooper and Renee Zellweger`s relationship seems to have hit a rough patch.

According to reports, Zellweger`s constant presence on the sets of Cooper`s new movie "The Dark Fields", has been irking the actor and the crew of the film had also started joking that the "Bridget Jones` Diary" star should be listed in the credits because she spends so much time on the set. "They were talking marriage and kids, but I wouldn`t be surprised if he breaks things off sooner than later," said a source. IANS