Lena Dunham strips down for body positive lingerie campaign

Girls stars Lena Dunham and Jemima Kirke are stripping down to their underwear for a new body positive lingerie campaign.

The actresses and best friends are no strangers to getting naked in front of the camera for their hit TV series, but now they're donning sexy pieces from the Lonely Lingerie collection to inspire women to love the skin they're in.

The brains behind the New Zealand-based brand, who make underwear for women who "wear lingerie as a love letter to themselves", have an ongoing series titled the Lonely Girls Project - a campaign featuring "candid portraits of inspiring women in their natural environments wearing Lonely in their own way."

The company's founder Helene Morris recruited the actresses to front the latest ad burst, and Lena and Jemima jumped at the chance to show off their underwear in an un-retouched photograph.

In the shot, Lena sits on the edge of a bathtub on a small bathroom, with her legs stretched out on Jemima's lap, as she sits in a chair. Lena wears a lacy, sea-foam green bra-and-underwear set called the Penny, while Jemima's sheer purple set, the Bonnie, features lace detailing around the edges of the bra and underwear.

"Lonely aspires to showcase women wearing underwear in a way that we usually don’t see in mainstream advertising and the media," a statement from Lonely Lingerie reads. "Instead of being objectified, the women who participate in these campaigns - in this case, Lena and Jemima - are empowered and exhibit real beauty that will hopefully help women everywhere feel a little more liberated."

Lena has been a longtime fan of the brand, having shown off a similar bathroom snap on Instagram while wearing a Lonely Lingerie set last year (15).

"Love my @lonelylingerie and I think I will wear it to dinner with some boots & a smile because we are all very lucky to be free," she wrote as a caption.