Despite their 27-year age difference (Piven is 45; Cyrus is 18), the "Entourage" star says he had a blast filming "So Undercover" with the teen star in New Orleans.
"I think I must be an 18-year-old girl because we got along really well," Piven told E! News while promoting his new drama "I Melt With You" at the Sundance Film Festival in Park City, Utah. "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."
Though Cyrus has had her fair share of controversies recently -- she was caught smoking salvia out of a bong on November 28 -- Piven insists the "Hannah Montana" star has a good head on her shoulders.
"You know, you can judge her, but what were you doing when you were 18?" he asked. "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."