Photo by Dimitrios Kambouris/Getty Images for John Varvatos

As you heard with Quinn & Cantara this morning, the news of David Letterman's retirement wasn't broken by an entertainment reporter -- it was ex-R.E.M. bassist Mike Mills.

Mills and ex-R.E.M. guitarist Peter Buck were performing on Thursday night's episode of the Late Show as part of Joseph Arthur's band. And after Letterman made his announcement to the audience, Mills tweeted "Dave just announced his retirement #2015 #muchlovedave." The news spread quickly after his tweet as the media attempted to confirm the story.