It took Ana de Armas 9 months to get Marilyn Monroe's voice right for her upcoming Netflix movie

• Ana de Armas plays Marilyn Monroe in the upcoming Netflix movie, "Blonde."
• She told The Sunday Times "it was a big torture" getting the icon's voice right, which took nine months in total, she said.

To pull off playing Marilyn Monroe you don't just have to get her look right, but also her voice. And that was a major challenge for Ana de Armas.

The Cuban-born actress known best for her role in "Knives Out" and the upcoming James Bond movie, "No Time to Die" (as well as her seemingly recently-ended relationship with Ben Affleck), revealed in a new profile in The Sunday Times of London that she spent a lot of time getting her voice to come close to the bubbly high-pitched tone that the iconic starlet Monroe had for the upcoming Netflix biopic, "Blonde."

"I tried!" de Armas, 32, said. "It only took me nine months of dialect coaching, and practicing, and some [automated dialogue replacement] sessions."

"It was a big torture, so exhausting," she continued. "My brain was fried."

In "Blonde," based on the 2000 novel by Joyce Carol Oates, de Armas plays Monroe, who became a "blonde bombshell" star in Hollywood thanks to her comedic performances in movies during the 1950s like "Gentlemen Prefer Blondes," "The Seven Year Itch," and "Some Like It Hot."

Her stunning looks and iconic style turned her into a legend following her untimely death in 1962 at the age of 36.

Michelle Williams was the last to deliver a memorable performance playing Monroe. In the 2011 movie, "My Week with Marilyn," she earned an Oscar nomination. At the time, Williams told Deadline in an interview how she went about tackling the legend's distinct voice.

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"In watching everything she ever did, I saw her experimenting and forming Marilyn Monroe over time," Williams said of Monroe, whose real name was Norma Jeane. "Her voice is much lower, the sexy husky thing is in a lower register and it became breathier and higher as she developed her persona. So I could actually see it being built and follow her steps. It gave me courage: This didn't come naturally to her, so I didn't have to expect it to come naturally to myself."

Hopefully, that little factoid found its way to de Armas in the process of transforming her voice, which has a distinct Cuban accent, into one of the most recognizable in movie history.

"Blonde" will be released on Netflix later this year.