"Thank you very, very much," Bale said after he and the cast took the stage and were greeted with a standing ovation. "On behalf of all of the cast from the movie, thank you very much to the fans and here's to Heath."
"Your excitement about the film has been the greatest reward we can imagine, so thank you very much," added director Christopher Nolan.
Ledger died last January at the age of 28 of an accidental prescription drug overdose.
Justin Bieber crashes Drake Bell's album release party
Rosie O'Donnell unveils nearly 50-pound weight loss