Miley Cyrus Lends Her Voice To Documentary 'Free The Nipple' That Shows Topless Women On NY Streets [SEE VIDEO]

U.S. singer Miley Cyrus performs at the O2 Arena in central London May 6, 2014. REUTERS/Olivia Harris REUTERS/Olivia Harris

Miley Cyrus is not someone who is shy about shedding her clothes and posing nude. She is now flaunting her breasts for a campaign called "Free The Nipple." The 21-year-old singer, who has earlier promoted the campaign on her social media accounts, has now recorded a song for its documentary by the same name, according to various media outlets.

Directed by Lina Esco, the documentary is about female activists who are not in favour of the law that bars women from showing their breasts in public. The movement questions the fact that if it is legal to show beheading on Facebook, why is it not legal for women to breastfeed in public?

"I've always questioned the fact that women are not equal to men and that really bothered me. It's not about going topless, it's about equality," Esco said to Entertainment Weekly about the movie, trailer of which can be seen below.

The 29-year-old first-time director and crusader of this movement "Free The Nipple" found an ally in songstress Miley Cyrus who made it popular in Dec. 2013 by posting her topless shot on Twitter, with a hashtag "Free The Nipple." The Twitter page of this movement now has more than one hundred thousand followers.

Lina met the "Wrecking Ball" songstress when they were working together on a project and came up with an idea of making a movie on the issue. She has shot the movie on New York streets and it shows topless women walking freely. Lina also got Miley record a cover of Melanie Safka's song "Look What They've Done to My Song, Ma" for the documentary, according to Variety. The singer reportedly recorded the song in just two takes way back in August.

"It's more rock 'n' roll. It's very Johnny Cash. Her voice is so raw, and the song is so raw," Esco said to Variety.com while talking about Miley's song. "Free The Nipple" was started off by Lina in 2013 and is today supported by several celebrities, including Lena Dunham, Liv Tyler and Rihanna apart from Miley. The movement opposes the law in 37 states that bans women from showing off their breasts in public.