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FILE - In this May 5, 1964, file photo, singer Lesley Gore hugs a flowered record at her 18th birthday party celebrated at the Delmonico Hotel in New York. Singer-songwriter Gore, who topped the charts in 1963 with her epic song of teenage angst, "It's My Party," and followed it up with the hits "Judy's Turn to Cry," and "You Don't Own Me," died of cancer, Monday, Feb. 16, 2015. She was 68. (AP Photo/Marty Lederhandler, File) Image Credit: AP

Singer-songwriter Lesley Gore, who topped the charts in 1963 at age 16 with her epic song of teenage angst, It’s My Party, and followed it up with the hits Judy’s Turn to Cry, and the feminist anthem You Don’t Own Me, died on Monday. She was 68.

Gore, a nonsmoker, died of lung cancer at New York-Presbyterian Hospital in Manhattan, according to her partner of 33 years, Lois Sasson.

“She was a wonderful human being — caring, giving, a great feminist, great woman, great human being, great humanitarian,” Sasson, a jewellery designer, said.

Brooklyn-born and New Jersey-raised, Gore was discovered by Quincy Jones as a teenager and signed to Mercury Records. She graduated from Sarah Lawrence College with a degree in English/American literature.

Gore’s other hits include She’s A Fool, Sunshine, Lollipops and Rainbows, which Marvin Hamlisch co-wrote, That’s the Way Boys Are and Maybe I Know. She co-wrote with her brother, Michael, the Academy Award-nominated Out Here On My Own from the film Fame.

She sang at the 1964 T.A.M.I. Show in Santa Monica, California, alongside future Rock and Roll Hall of Famers like the James Brown and the Rolling Stones. Gore also played Catwoman’s sidekick in the cult TV comedy Batman.

“She was a serious artist that was way ahead of her time,” said Ronnie Spector in a statement. “She had a certain sound. But you want to be able to do new things too, and it can be hard on an artist that is so identified with a specific sound. Although she wasn’t in a girl group, Lesley was definitely a huge part of that era. But she continued to be creative, and kept looking ahead, and that’s how I will remember her.”

In a Facebook post, songwriter Neil Sedaka, who attended Gore’s Sweet 16 birthday party, shared his thoughts: “She was a great person and a phenomenal talent, who had opened for me on many occasions. She recorded a few of my songs (Magic Colours and Summer Symphony) and was a great songwriter in her own right. I’m glad I had the chance of knowing her.”

In the 1990s, Gore co-wrote My Secret Love for Allison Anders’ film Grace of My Heart, released in 1996. A couple of years later, she appeared in Smokey Joe’s Cafe on Broadway. Gore had been working on a stage version of her life with playwright Mark Hampton when she died.

In 2005, she released Ever Since, her first album in 30 years, but was sure to revisit older hits in front of fans. “If I’ve learned anything in this business,” she told The New York Times that year, “how stupid would it be not to do It’s My Party when people come to hear it?”

She officially came out to the public when she hosted several episodes of the PBS series, In The Life, which dealt with gay and lesbian issues.

During the 2012 presidential campaign, Gore turned You Don’t Own Me into an online video public service announcement demanding reproductive rights which starred Lena Dunham and Tavi Gevinson, among others

In the last few years, she performed at Feinstein’s at the Loews Regency in New York and, along with Spector and LaLa Brooks, headlined the She’s Got the Power concert outdoors at Lincoln Centre in 2012.

In addition to Sasson, Gore is survived by her brother and mother, Ronny. Services will be held on Thursday at the Frank E. Campbell funeral home on Madison Avenue.