Stephen Colbert sign offs on Dec. 18

Hopefully, as he touts frequently on Twitter, his last show will be "my best yet."

Stephen Colbert's final date as host of Comedy Central's The Colbert Report is Thursday, Dec.18.

While pitching his book America Again: Re-becoming the Greatness We Never Weren't, Colbert made his big announcement. And, of course, it was delivered in his signature way.

"Stephen Colbert, the guy you've seen here every night for nine years, will be gone. All you'll have left of me is this book," he said.

He takes over for David Letterman in 2015.