And on Friday, Feb. 4, he'll deliver the Top 10 list.
Maybe it's part of the Grammy hype. Letterman's network, CBS, will telecast the annual awards show on Sunday, Feb. 13, and Bieber is scheduled to perform with Usher and Jaden Smith.
Or maybe somebody at CBS is just a big Bieber fan. The teen will reprise his role as a murderer on the Thursday, Feb. 17, episode of "CSI."
By the way, Letterman has already done a Justin Bieber Top 10 list. But it was "Top 10 Reasons I'm Glad to be Named Justin Bieber," read by a guy who isn't the famous Justin Bieber:
10. I really enjoy the look of disappointment when people first meet me.
9. I got a free trip to New York City out of it.
8. YouTube video of me mowing the lawn got ten million hits.
7. If I make an ass out of myself in public, he gets the blame.
6. Last week performed a sold out arena show in Delaware and no one knew the difference.
5. Reading all the fan mail from Letterman.
4. I made a hundred bucks selling some of my hair on eBay.
3. Due to a mixup at the post office, I'm the proud owner of a Teen Choice Award.
2. Aside from the constant harassment, the fact that no one takes me seriously, and the sense of inadequacy compared to a wealthy 16-year-old, what's not to like?
1. I just thank God I'm not named Charlie Sheen