Ashton Kutcher Punks Demi Moore's Coworker

Ashton Kutcher Punks Demi Moore's Coworker
Demi Moore and daughter Tallulah Belle
Stephen Lovekin/Getty

03/25/2008 AT 11:40 AM EDT

Demi Moore's new movie is terrific, but the set really stunk.

Turns out her husband, Ashton Kutcher, punked a prop man with "stinky cheese."

At Monday night's Cinema Society screening of Flawless in New York City, the actress's new diamond heist thriller, Moore described the smelly feud between her prank-prone hubby and a worker on her Luxembourg set.

"The prop man started it with eggs and stinky cheese," Moore, wearing a white Chanel coat, told PEOPLE. "[It was during] a scene where I had to open a locker and be very serious. I opened it, and it smelled like something had died! Ashton happened to be visiting and he participated in a little retribution."

Just how did they even the score? "All I can say is that the prop man, after a week, found his jacket that had cheese zipped inside various places," the 45-year-old actress explained.

There is obviously no such feud with Moore's ex husband, Bruce Willis, who showed up at the event to show his support. The actor arrived with his Victoria's Secret gal pal Emma Hemming – and Moore greeted them both with smooches and hugs.

"Demi is a fabulous actress," Willis raved to PEOPLE. "[She's] really great in this film. I'm quite proud of her, actually."

He left at around 11 p.m., walking out with his 14-year-old daughter, Tallulah Belle (who affectionately held Hemming's hand).

What's the secret to their happy blended family? It's simple, said Willis. "We're all great friends still."

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