Lena Dunham meets fans and signs copies of her book, "Not That Kind of Girl," at Waterstones, Piccadilly, Oct. 29, 2014, in London.
camera (Stuart C. Wilson/Getty Images) Lena Dunham meets fans and signs copies of her book, "Not That Kind of Girl," at Waterstones, Piccadilly, Oct. 29, 2014, in London.

Lena Dunham has always been outspoken on the subject of women's reproductive rights.

Now, she's enlisting the help of her A-list pals to spread the word about Planned Parenthood Action Fund's Women Are Watching Campaign, an initiative aimed to encourage women to vote for politicians who support that cause.

"We hear a lot about how apathetic our millennial youth are, but that just hasn't been my experience. My friends, as well as the young women I met on my book tour who are friends now too, have so much joy, anger, hunger for change," the actress told Glamour magazine. "I want us to show up at the polls in record numbers, to show that we won’t stand for attacks on women and their rights, that we recognize our power to shape the future."

So, Dunham, 28, teamed up with Planned Parenthood to design a T-shirt that reads, "Lena [Hearts] Planned Parenthood," to promote the campaign. (It's currently on sale for $25 online.) The "Not That Kind of Girl" author has posted photos of her famous friends wearing it too. Here are a handful, below.

Mindy Kaling

Ellen Page

More bold brave models tomorrow... But dream of Ellen Page tonight:

A photo posted by Lena Dunham (@lenadunham) on Oct 10, 2014 at 5:12pm PDT

Jemima Kirke

Gabrielle Union

Is there anything fiercer than @gabunion ? #womenarewatching #weheartplannedparenthood

A photo posted by Lena Dunham (@lenadunham) on Oct 10, 2014 at 5:24am PDT

America Ferrara

Goddamn, America Ferrera, you slay me #womenarewatching #weheartplannedparenthood

A photo posted by Lena Dunham (@lenadunham) on Oct 10, 2014 at 5:25am PDT

Amy Poehler

The angel known as Knope #amypoehler #womenarewatching #weheartplannedparenthood

A photo posted by Lena Dunham (@lenadunham) on Oct 10, 2014 at 5:26am PDT