Charlize Theron is no stranger to an on-screen
For her Oscar-winning role as Aileen Wuornos in Monster
, Theron gained 30 pounds and
wore prosthetic teeth to portray the real-life serial killer. And in her latest
film, Mad Max: Fury Road
39-year-old actress shaved her head.WATCH: The 9 Most Insane Things That Happen in the New 'Mad Max' Trailer
The looks are shockingly different—and a far cry from the
more glamorous roles, such as Queen Ravenna in Snow White and the Huntsman --
but Theron says it's all about respect.
"Every movie is its own animal and you have to respect it
and treat it that way," she tells ET at the premiere of her new film. "This one
was just a naturally a long process because the movie took so long to make, but I had a lot to have the story really inform me as to what I needed to do
and what needed to happen. So I was grateful for the time."
PHOTOS: Shocking On-Screen Body Transformations
In fact, shaving her head was not only for the role but a
necessity for making Mad Max
. "I just had this moment where I was like, 'I need
to shave my head! I can't think about what I'm going to do with my hair in this
movie. I'm going to be in the desert. I'm a new mother. Let's just shave it,’”
she revealed to ET in April
. "The next day we did it. I can't even imagine
doing it any other way."
And speaking of becoming a mother, Theron tells ET what she
has planned for Mother's Day.
"The whole family is trekking down to Cannes," she says. Of
course, that includes her mother, Sean Penn
and her son Jackson, who she has
to make it up for not taking him to the premiere.
"He was a little upset that he wasn't invited to the party
tonight," Theron says.
Well, the Cannes Film Festival
is not a bad alternative.
Mad Max: Fury Road
is in theaters on May 15.