EXCLUSIVE: Meryl Streep Reveals How She Created Her Unique Rocker Look in 'Ricki and the Flash'

We all know that Meryl Streep is the queen of completely transforming her appearance for her big screen roles.

From her chic and sleek look in The Devil Wears Prada, to her witchy wig in Into the Woods, and her demure transformation in Doubt -- Meryl has mastered it all.

So how did the Oscar-winning actress come up with her unique rock 'n' roll hairdo in the family dramedy, Ricki and the Flash? ETonline has your behind-the-scenes explanation from none other than Streep herself about how she created such an edgy look.

WATCH: Why Meryl Streep Has Always Been the Queen of the Golden Globes!

"This is the first movie in a really, really, really long time that I haven't had my longtime collaborator Roy Helland, who does hair and makeup for me," Streep explains in our exclusive video above.

"Roy had given me some fake hair and when you buy fake hair it comes in three braids," she notes. "And I just sort of fell in love with this look of pulling it [back] and letting the braids go down. It was weird."

"She holds onto that identity really really strongly and fiercely," Streep says of her character, Ricki, a one-time wife and mother of three who left her family behind to follow her dreams of rock 'n' roll stardom in California.

"That was how she looked in 1980 and it hasn't changed, except it has aged," Streep addd with a laugh.

Ricki & the Flash is out on Blu-ray, DVD & Digital now.