"I am delighted to be working with Tom again and excited to watch him bring to life our new interpretation of one of Batman's most formidable enemies," director Christopher Nolan said.
Hardy most recently starred in Nolan's hit thriller Inception as Eames, while Hathaway's credits include The Devil Wears Prada, The Princess Diaries and Alice in Wonderland. Her latest movie is Love and Other Drugs.
The third Batman film is set for a July 2012 release.
What do you think of the casting?