Adrian Grenier's movie-star character Vince will socialize with real stars at the annual event on the French Riviera in an upcoming episode of the show.
Kevin Connolly, who plays Vince's manager Eric Murphy on the HBO comedy, says, "We did Sundance once and now we're on to a bigger film festival. Everybody's here."
Connolly admits the episode's script is completely open to potential events at the festival in the next few days and he has no idea which A-listers may want to cameo.
He explains, "We can work on the fly--if (George) Clooney walks by and wants to be in, he's in. The sky's the limit."
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