Lena Dunham reveals upcoming book cover and its release date via Instagram

Hannah Horvath would be so proud.

The Brooklynite’s real-life alter-ego, Lena Dunham, will become a published author before the end of the year. And the “hardest-working millennial” chose a medium befitting of her generation to reveal the cover and release date of the tome – by posting a picture on Instagram.

The outspoken writer, producer and actor of the hit HBO series “Girls” posted a split-frame image of the book cover of “Not That Kind of Girl,” and another of her holding her first book.

The 27-year-old Dunham, who reportedly got a tony $3.5 million for the book deal by Random House, wrote on Twitter: “It’s official. Coming 10/7/14.” She links to the photo on her Instagram account.

As Entertainment Weekly notes, the cover mock-up isn’t dissimilar to that of the pulpy 1960s cover of “Valley of the Dolls.”

The publishers are touting the tome as a great read for those who love David Sedaris, Tina Fey, and Nora Ephron.

“No, I am not a sexpert, a psychologist, or a registered dietician,” Dunham herself said about the book.

"But I am a girl with a keen interest in self-actualization, sending hopeful dispatches from the front lines of the struggle.”