It seems that both usages are well represented in the english language, and I'd say that the option with the definite article left out is more common. Am I correct about this? I'd say you probably are.
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AnonymousDoesn't the use of the definite article suggest that George Clooney is the only actor rather than an actor?It means that there might be more than one person named "George Clooney" in the world, but there is only one who is a well-known actor. That is the person that the writer is talking about.