And the late-night changes just keep on comin'...

During a "Late Show" taping Thursday, David Letterman announced that he will retire in 2015 after 33 years as a late-night talk show host.

Before the show, Letterman called CBS president Leslie Moonves, telling him, "And I said ‘Leslie, it’s been great, you’ve been great, and the network has been great, but I’m retiring.'"

He later added, "Moonves, he and I have had a relationship for years and years and years, and we have had this conversation in the past, and we agreed that we would work together on this circumstance and the timing of this circumstance."

"I just want to reiterate my thanks for the support from the network, all of the people who have worked here, all of the people in the theater, all the people on the staff, everybody at home, thank you very much," Letterman said, then joked, "What this means now, is that Paul and I can be married ... we don’t have the timetable for this precisely down – I think it will be at least a year or so, but sometime in the not too distant future, 2015 for the love of God, in fact, Paul and I will be wrapping things up."

Letterman has been hosting "The Late Show" since 1993. Before then, he hosted "Late Night with David Letterman" on NBC for eleven years.

In a statement, Moonves said, "For 21 years, David Letterman has graced our Network’s air in late night with wit, gravitas and brilliance unique in the history of our medium. During that time, Dave has given television audiences thousands of hours of comedic entertainment, the sharpest interviews in late night, and brilliant moments of candor and perspective around national events. He’s also managed to keep many celebrities, politicians and executives on their toes – including me."

"There is only one David Letterman," Moonves continued. "His greatness will always be remembered here, and he will certainly sit among the pantheon of this business."

See the video of his announcement here.