Amber Heard reveals the naughty 'Paranoia' set prank she pulled on Liam Hemsworth

liam-hemsworth-amber-heard-paranoia-set-prank-gi.jpg Liam Hemsworth was left red-faced on the set of his new film "Paranoia" after finding himself the victim of a pretty wild prank at the hands of his co-star Amber Heard.

While at the film's Los Angeles premiere on Thursday (Aug. 8), Heard revealed all, telling reporters that during a steamy sex scene between the two, when Hemsworth went to grab what he thought was Heard's arm, he came up with holding a giant adult toy.

"It's not a little prank. It was a big prank," Heard teased.

When asked how she got director Robert Luketic and the crew on board with her ruse, Heard happily explained, "Well, I saw a discarded large dildo in the prop truck and I asked if I could borrow it, and after not so long of a pause the prop guy happily handed it over to me.

"I talked to Robert and the producers and made sure that once we got the take and were good, that we could ask for one extra," she adds. "And unbeknownst to Liam, I just switched out my arm for the dildo."

While Hemsworth was left a bit embarrassed by the fun had at his expense, Heard insists, "He loved it."

When the actor spoke with E! News about the prank, he laughed it off. "It was about that big, a black one," Hemsworth said, holding his hands about two feet apart. "And I pulled it out, and everyone was in on it ... except me, yeah."
Photo/Video credit: Getty Images