Hanging out with Miley Cyrus brings out Jeremy Piven's inner teen.

Though the Entourage star, 45, is 27 years older than Cyrus, he said he had a blast working with the Hannah Montana star while shooting the comedy So Undercover in New Orleans. "I think I must be an 18-year-old girl because we got along really well," Piven told E! News. "It was just so much fun. I had so much fun with her and we had great chemistry. It was really really weird — we're like polar opposites."

Piven also had some words for Cyrus's critics. "You know, you can judge her, but what were you doing when you were 18?" he said. "She's kind of amazing. There's something so incredibly refreshing about someone who is exactly who they are. There's nothing pretentious about her. She's this force. She loves to laugh." —ISHITA SINGH


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