Whoever worried this year's Cannes Film Festival was short on stars only needed to take a stroll through the Vanity Fair Party on Saturday night at the Hotel du Cap-Eden-Roc, which looked like the Oscars in May.

Justin Bieber shook hands with fans and posed for snapshots. Jennifer Lawrence lounged with her "Hunger Games" stars Josh Hutcherson and Liam Hemsworth. Harrison Ford and Sylvester Stallone (in a white tux) were there, too, alongside Julianne Moore, Guy Pearce, Kelsey Grammer, Scott Speedman and Adrian Grenier.

PHOTOS: Justin Bieber, Jennifer Lawrence and Robert Pattinson at the Vanity Fair/Armani Party

But the actor with the biggest smile on his face may have been Robert Pattinson, who earned some of his best reviews yet for "The Rover," the Australian action film directed by David Michod which screened to critics over the weekend. He also had strong buzz going into Monday's competition debut of "Maps to the Stars," a drama directed by David Cronenberg.

"He's incredibly respectful," Pattinson told Variety, saying he would love to collaborate with Cronenberg again. The two first worked together on 2012′s "Cosmopolis."

Pattinson said that he's getting ready to shoot actor Brady Corbet's directorial debut, "The Childhood of a Leader." He added that "Brady is just brilliant." And Pattinson revealed that he's been talking to "Spring Breakers" director Harmony Korine about starring in one of his upcoming projects, although the details haven't been worked out yet.

Pattinson acknowledged the role of Edward Cullen that made him an international superstar came as a complete surprise.

"No one thought it was going to be a big deal," Pattinson said of the 2008 vampire movie. "We thought it was going to be like 'Thirteen,'" he said, referencing the directorial debut of Catherine Hardwicke.

"I couldn't do another 'Twilight' movie," said Pattinson, who is 28. "I'm too old."

(Pictured: Liam Hemsworth and Robert Pattinson at the Vanity Fair/Armani party)

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