Meryl Streep is going through some changes!

The Oscar winning actress recently underwent a dramatic transformation for her role as former British prime minister Margaret Thatcher in a forthcoming biopic about her life called “The Iron Lady.”

“The prospect of exploring the swathe cut through history by this remarkable woman is a daunting and exciting challenge,” Streep said in a statement from the film’s producers. “I am trying to approach the role with as much zeal, fervour and attention to detail as the real Lady Thatcher possesses — I can only hope my stamina will begin to approach her own.”

The movie, due for release later this year, also stars Richard E. Grant, comedian John Sessions and veteran British actor Jim Broadbent who will play Thatcher’s husband Denis.

The script for the film, which began shooting at the end of January, covers a broad sweep of Thatcher’s career, and is said to be about “a woman who smashed through the barriers of gender and class to be heard in a male-dominated world.”

Margaret Thatcher, whose nickname gives the film its title, is the only woman ever to be British prime minister and is now 85 years old.

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