Elizabeth Hurley said it was a "nightmare" working with Matthew Perry on their 2002 film "Serving Sara," which was shot at the height of his drug addiction. 

The production had to be abruptly shut down because the "Friends" star needed to enter rehab for two months. 

Still, the "Royals" actress doesn’t hold it against Perry, who detailed his addiction struggles in his new memoir, "Friends, Lovers and the Big Terrible Thing." 

Hurley recently told Yahoo! Entertainment it was a "little tough" during the film’s hiatus. But when he returned to filming after two months in rehab he was "fabulous."

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Split photo of Elizabeth Hurley and Matthew Perry

Elizabeth Hurley and Matthew Perry starred in 2002's "Serving Sara" together.  (Noam Galai/Frederick M. Brown)

Hurley, who said Perry had to "revoice" everything he shot before rehab, added, "obviously he was having a tough time, but he was still very charming and a lovely person to work with, but you could see he was suffering for sure."

Perry said he had to redo his lines because he was initially slurring them.

Elizabeth Hurley and Matthew Perry at the "Serving Sara" premiere in 2002

Elizabeth Hurley and Matthew Perry attend the 2002 premiere of "Serving Sara." The actress said it was a "nightmare" to work with him at the height of his drug addiction.  (Steve Granitz/WireImage)

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The movie was "shot in Dallas, and I was doing ‘Friends’ at the same time, so it doubled my workload," Perry wrote in the book. 

"And I was flying on a private jet drinking vodka out of a water bottle," he said. The actor wrote that, at one point, he was taking 55 Vicodin tablets and drinking a quart of vodka a day. 

Matthew Perry as Chandler Bing in "Friends" wearing a sweater-vest

Matthew Perry said he was shooting "Serving Sara" at the same time as "Friends," adding he drank vodka while flying between Los Angeles and Dallas.  (Gary Null/NBCU Photo Bank/NBCUniversal )

"I weighed 155 pounds, on my way to 128 pounds," he said. "I feel too sorry for that guy, he's going through too much, and it's me. And I remember that, and I didn't understand what was going on. But, again, I'm sorry, and I'm so grateful to not be that anymore."

He says he has been sober over a year now. 

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Representatives for Perry didn't immediately respond to Fox News Digital's request for comment.