The pair worked together on 'The Dark Knight' in which Bale played Batman and Ledger his arch nemesis The Joker and the 38-year-old is proud to have gotten to know him, reported Contactmusic.
"I have absolutely wonderful memories of Heath. I'm very proud that I got to know him as a friend, and work with him, and he's as much a part of this movie, 'The Dark Knight Rises', as he was 'The Dark Knight'.
"He created such a wonderful portrayal, that will always be remembered, and I'm very proud to have been a part of that," he said.
The actor ruled out a return to the superhero franchise now that he has completed the third and final film in the Christopher Nolan-directed movie series.
"I believe Christopher Nolan when he says it (a reboot) won't be from him, and therefore it will not be me. But I absolutely do believe there will be a reboot, and I'm very fascinated to see what incarnation that will take," he said.