Mystery Speaker: Is it Clint? (Update: Confirmed)

Fox claims to have the scoop:

Officials confirmed Wednesday that a surprise guest was still on the schedule but declined further comment.

One Republican source told that Eastwood is indeed the mystery speaker, following an online report that claimed the actor is planning to travel to Tampa for the convention.

US News seconds with a named source:

A close friend of Mitt and Ann Romney confirmed to Whispers Wednesday night that Clint Eastwood is indeed Thursday's mystery speaker at the Republican National Convention.

"It's him," said Paul Gilbert, who has known the Romney family for nearly a decade and served as the GOP presidential candidate's Arizona state chair. "I can confirm that, 100 percent."

Eastwood is almost alone among the A-list of Hollywood's A-list. There's no question that he can deliver a line as well as anyone and better than just about everyone. If he is the mystery speaker, tonight is going to be a very good night.