Renee Zellweger on the ‘Life Blessing’ of Transforming Into Judy Garland for ‘Judy’ Biopic (Exclusive)

ET went behind the scenes with the actress as she dished on the part, including what it was like to undergo her transformation.

Renee Zellweger is still counting her lucky stars for landing the role of Judy Garland in Judy, which brings the music and story of the icon to the big screen.

ET went behind the scenes with the 50-year-old actress as she dished on the part, including what it was like to undergo her transformation to become Garland.

“This one will be a hard thing to describe,” Zellweger said about donning a short brown wig and dramatic makeup for the role. “It was a great life blessing. It really was.”

The film is set in 1968 at a time when Garland headed to London in an effort to revive her career.

She died at the age of 47 due to an accidental overdose and her drug and alcohol issues are covered in the movie.

Zellweger -- who sang songs like, “Somewhere Over the Rainbow,” live during filming -- said she ultimately wanted to show all facets of Garland’s life, including the good, the bad and the ugly.

“She mattered so much to so many people and she touched the lives of so many people, we want to show her the love that she shared with all of us,” she said. “And, boy, what a special experience that was.”

Garland’s three children are also represented in the film, and her real-life daughter, Liza Minnelli, admitted to ET in June that she was wary of how Zellweger would portray her mom.

“I think she's a wonderful actress and I just hope they don't do what they always do,” she said."That's all I've got to say."

The first trailer for the movie was released in May and showed Zellweger singing "Somewhere Over the Rainbow."

See more on the film below.

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