Thomas Payne, aka Jesus on "The Walking Dead," busted out a surprise performance last weekend of Aerosmith's "I Don't Want to Miss a Thing." Thomas and a bunch of other 'Dead' stars were in Iselin, NJ for a fan convention.

We're told TP was drinking at the hotel bar when he decided to jump on stage with the local faves, Chapter 2 Band, and did his best Steven Tyler impression. We'll say this -- he went for it.

Thomas was on a roll -- he also belted R. Kelly's "I Believe I Can Fly."

He did all this singing while complaing about a stomach ache. Not that you can tell. Much.