The 37-year-old actor is once again reprising his role as Phil Wenneck in the comedy franchise and without divulging much details about the storyline he thinks it will be a good ending, reported Sun online.
"We're in Los Angeles, and Vegas, and Tijuana. This film is a perfect closure to the series. But I'm sorry, that's all I can say," he said.
Cooper, who is playing bipolar sufferer Pat Solitano in new movie 'Silver Linings Playbook', says he wanted to make sure he portrayed him in a realistic way.
"Well, if you're diagnosed as having bipolar disorder, it's not like there's a sheet saying, 'This is what it is.' David O'Russell (the director) says that mental illness is much like snowflakes - no two are the same.
"I watched a lot of footage to learn about people who have suffered mentally, but ultimately we just created a character based on his made up history. Pat lives in a bit of a delusion in order to cope with his life. He doesn't have a filter."