Late-night talk show host David Letterman has triggered the wrath of movie fans, after he apparently revealed a key plot twist for the new "The Dark Knight Rises" movie.

During an interview with actress Anne Hathaway  --  who plays Catwoman in the film -- Letterman stunned her by apparently revealing part of the plot, which has been kept super-secret by director/writer Christopher Nolan.

During the chat, Letterman said, ""It's not essential to see all the previous installations of Batman, and I think this is it, and in the end, [spoiler here]."

"The wrath you have just invited onto yourself!" said Hathaway to Letterman. Turning to the camera, she addressed Nolan: "Chris, I had no part in it, I'm sorry."

It is not known if Letterman's spoiler is genuine; "The Dark Knight" hits U.S. theaters on July 20. But the blogosphere ignited with fans slamming Letterman.

"Dave has 'OLD TIMERS'' disease. It happens to everyone," commented Mad Hatter 1 on the Huffington Post, while @dirtytea tweeted: "Avoid David Letterman interview with Anne Hathaway, he spoils the ending."