David Letterman retiring from "Late Show" this 2015 is absolutely a total shocker to moat of the TV personality's fans. Just nearly two months after Jay Leno departed from NBC's "Tonight Show," Letterman has voiced out his plan of stepping down from Leno's show's longtime rival come 2015.

"The man who owns this network, Leslie 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," Letterman said at Thursday's taping. "And I phoned him just before the program, and I said 'Leslie, it's been great, you've been great, and the network has been great, but I'm retiring.'"

"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. What this means now is that Paul and I can be married," David added, according to Yahoo News!

The soon-to-retire Letterman then revealed that although there isn't a fixed timetable for his departure from the "Late Show," he has already made up his mind that 2015 will be the year of his exit.

Former REM bassist Mike Mills was the first one to leak the report on Twitter that David Letterman is retiring.

"Dave just announced his retirement #2015 #muchlovedave," Mills' tweet reads.

Just a few minutes later, CNN reporter Brian Stelter confirmed what Mills wrote on the social networking site.

"It's true. David Letterman just announced he is retiring in 2015. More soon," Stelter tweeted.

After 33 years of successfully hosting the late night show, David Letterman is now retiring. And since David has done a great job in running the show, many are now wondering on who is going to replace Letterman.

It can be noted that Jimmy Fallon handed over his "Late Night" hosting gig to Seth Meyers so he could replace Jay Leno. So who is possibly the next big thing to take over Letterman's show?

TVLine has pointed out 13 possible replacements for the retiring David Letterman:

1. Stephen Colbert

2. Jay Leno

3. Chelsea Handler

4. Jon Stewart

5. Craig Ferguson

6. Whoopi Goldberg

7. Conan O'Brien

8. Neil Patrick Harris

9. Tina Fey

10. Kevin Hart

11. Louis C.K.

12. Jerry Seinfeld

13. Jimmy Kimmel

TVLine has even created a poll, to get feedback from people on who they think is deserving to replace Letterman from his long-running show; however, the official result of the poll is still not available.

Apart from the online poll, CBS has not revealed yet the celeb who will be taking David's place on the hit late night talk show.