John Oliver, Jon Stewart, Jimmy Fallon, Seth Meyers and more had cameos during the July 21 episode of "The Late Show With Stephen Colbert."

The September event, coming to New York for the first time, will also include panel discussions with Robert Downey Jr., David Letterman and Richard Ayoade.

NEW YORK — Stephen Colbert has received support from his fellow late-night TV hosts following his cancellation by CBS, including from his predecessor. David Letterman, who was the host of “The Late Show” for 22 years, used his YouTube channel to post a video montage of the many times he ripped into CBS over the years for various reasons.

In 1993, he started working as a writer-producer on Late Night with David Letterman, which aired on NBC. Burnett ultimately made the move to CBS with Letterman when The Late Show was picked up at that network.

The actor was promoting the mockumentary 'I'm Still Here' when he delivered one of the strangest interviews ever recorded for late night television.

J oaquin Phoenix has apologized for his controversial 2009 appearance on The Late Show with David Letterman. Phoenix, in character for his role in the mockumentary I'm Not Here, answered Letterman's questions with mumbles and one-word answers, leaving the host and the audience confused.

There was truly nobody like David Letterman. The longest reigning late-night host in history, Letterman was quick-witted, irreverent, and hilarious. But it wasn't all laughs—for David Letterman, fame came at a terrible price. So what was Dave's life like ...