Sylvester Stallone working on his own biopic

London: Action star Sylvester Stallone is making plans to bring his own life story to the big screen, according to his mother Jackie.

The `Rocky` star has written and directed a number of projects throughout the years, and he has now focused his attention on making a movie about his upbringing and lengthy career in Hollywood, reportedly.

"Sylvester is doing the story of his life, his own biog(raphy). He`s got Rambo V to film and he`ll be going to Budapest to begin the Expendables 4 - so he`s filming his biopic in between," Jackie said.