Lesley Gore

Her death was confirmed by family friend Blake Morgan, who produced her 2005 album, “Ever Since.”

“We loved her and we are very sad. She was an incredibly powerful, incredibly beautiful talent,” he said.

According to People magazine, the cause of death was cancer.

Gore, born Lesley Sue Goldstein, had just turned 17 when “It’s My Party,” produced by Quincy Jones, topped the charts in June 1963. The song, about a girl whose party is ruined when she catches her boyfriend, Johnny, with a rival, became a pop classic, its catchy chorus often imitated.

She was an overnight success, with fans suddenly converging on her family’s house in Tenafly, New Jersey.

“When the disc jockey … would say, ‘That was Lesley Gore, the sweetie pie from Tenafly,’ well, people just came to Tenafly. You know, I’d wake up and there were people camped out on the grass,” she said in an interview, according to Biography.com.

The follow-ups, “Judy’s Turn to Cry” and “She’s a Fool,” were in a similar teen-love vein, but Gore’s next hit, “You Don’t Own Me,” was something else entirely.

“You Don’t Own Me,” also produced by Jones, was a dramatic assertion of independence and pride. Released in late 1963, it peaked at No. 2, kept out of the top spot by the Beatles’ “I Want to Hold Your Hand.” Over the years the song, written by John Madara and Dave White, became a feminist anthem, recorded by such artists as Dusty Springfield and Joan Jett.

During the 2012 presidential campaign, a number of celebrities — including Lena Dunham, Tavi Gevinson and Carrie Brownstein — appeared in a commercial lip-synching the song in an effort to urge women to vote.