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Lesley Gore hit No. 1 with "It's My Party" in 1963

Her hit "You Don't Own Me" became feminist anthem

Gore was also nominated for an Oscar

CNN  — 

Lesley Gore, whose No. 1 hit “It’s My Party” kicked off a successful singing career while she was still in high school, has died. She was 68.

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

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.

“It’s hard for me to believe but we’re still fighting for the same things we were then,” Gore wrote on her Facebook page in 2012. “Yes, ladies, we’ve got to come together and get out there and vote and protect our bodies. They’re ours. Please vote.”

The political activism suited Gore. After her singing career started winding down in the late ’60s, she volunteered for Robert Kennedy’s 1968 presidential campaign. She later worked for New York politician Bella Abzug and such projects as a Bronx community health organization,

“I worked for people like Robert Kennedy and I thought: ‘Wow, that’s what it’s about. That’s how you change the world,’ ” she told The New York Times in 2005.

She also did some acting, playing Pussycat, a Catwoman sidekick, on the TV series “Batman.”

As an adult Gore came out publicly as a lesbian, though she told the website she never tried to hi