Larry King Fumbledores Big Time -- Harry Potter, Who?

7/7/2011 3:45 PM PDT BY TMZ STAFF
Just days after interviewing "Harry Potter" star Daniel Radcliffe, 77-year-old Larry King had already FORGOTTEN the actor's name -- telling us, "I love the kid, Dennis. He's a great guy."

We love him, too. But our favorite is Emily Watson.