City readers have picked rock star Patti Smith’s heartbreaking memoir “Just Kids” — which details her relationship with avant-garde photographer Robert Mapplethorpe — for this year’s prestigious “One Book, One New York” award.

The honor, based on a poll, means that 1,000 copies of the book will be available at public libraries throughout the five boroughs.

City bookstores also likely will be stocking up on the title, according to a press release from the Mayor’s Office of Media and Entertainment, which partnered with Buzzfeed in conducting the poll.

Readers voted online in April to select the book.

“Just Kids,” originally published in 2010, details Smith’s friendship with Mapplethorpe, as well as her rise to fame, the making of her iconic album “Horses,” and the eclectic music scene of the early 1970s.

Smith, 72, shared her delight on Instagram.

“New York was the city that welcomed and formed us, was emblematic of our struggles and successes,” she posted.

“It is moving to imagine that our story will represent, through One Book/One New York, the countless stories of those who come to our diverse and complex city, with dreams of their own,” she wrote.

Smith added: “Robert would be as happy as I am to achieve this recognition, especially grateful that the book has been chosen by the same readers for whom it was written.”