Amanda Seyfried recalls being rendered speechless by a particularly shocking and naughty prank played on her by none other than one of the hottest prankster around, Channing Tatum.

The 29-year-old actress and the 35-year-old actor played love interests in the 2010 movie Dear John. The practical joke took place on the set.

"He's a prankster. He's really good at it but it's not like mean-spirited or like, scary. It's just gross," Seyfried, who is promoting her new film Ted 2, told E! News in a recent interview.

"He was just like standing really close to me and he was wearing bathing suit bottoms, 'cause we were shooting on the beach," she said. "I looked down and...I was just like, [gasps]."

Watch the video to see her imitate his mischievous reaction!

Amanda Seyfried, Channing Tatum, Dear John

Mike Marsland/WireImage

The actor has played practical jokes on his co-stars before. In 2011, while filming a nude scene with Rachel McAdams, 36 , for the movie The Vow, he surprised her by sporting a prosthetic penis.

"I did have a stunt pee pee that I had made for her for her reaction," Tatum told Entertainment Tonight. "It was a little prank that I pulled on her. It's in the movie—her reaction was spot on. I didn't have a lot of faith in her reaction because it was cold that day, and I didn't want her to be laughing and pointing. I wanted her to be shocked."

Despite the prank, it's all good between Seyfried and Tatum.

"He can do anything," she told E! News. "He's just the nicest man in the world."

Tatum recently pranked his own fans. The actor donned a disguise to a screening of Magic Mike XXL, in which he reprises his role as stripper Magic Mike, and later had a whole bunch of women screaming with delight as he revealed his true self...and gave one a lap dance.

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