Bobby Flay -- 'Cheater' Banner Crapped on My Shining Moment (TMZ TV)

Bobby Flay is now the FIRST celeb chef to get a star on the Hollywood Walk of Fame -- and the ceremony was awesome-ly ... embarrassing!

In the midst of his nasty divorce, someone decided to fly a banner over his big moment ... a banner that said, "CHEATER." Ooops! Perhaps just a huge typo?

Yeah, probably not.