The Miz

Newly crowned WWE world champ The Miz has stormed into the newsroom to host today's "TMZ on TV" -- and it's already getting INTENSE!! Dude even brought his own sippy cup -- you don't wanna miss this! Check your local listings.

Mike Mizanin -- a former reality star from "Real World: Season 10" -- was officially crowned as the heavyweight champion of the WWE last night ... after a huge surprise upset victory over Randy Orton. "The Miz" -- who came up with his own nickname during the MTV show back in 2001 -- began…