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Author Jackie Collins, whose bestselling potboilers about the rich and treacherous delighted millions, died Saturday in Los Angeles after a long and private battle with breast cancer.

Collins, 77, had been diagnosed with stage 4 breast cancer 6¹/₂ years ago, but had told few besides her three adult daughters, said People magazine, which first reported her death on its Web site.

Collins, who had dual British and American citizenship, was the sister of “Dynasty” actress Joan Collins, 82. In addition to her daughters, she had six grandchildren.

“She lived a wonderfully full life and was adored by her family, friends, and the millions of readers who she has been entertaining for over four decades,” the Collins family told People in a statement.

Collins wrote 32 novels, selling 500 million copies, according to her Web site.

Eight of her books were adapted into movies or TV miniseries.

Her most successful novel, “Hollywood Wives,” was published in 1983, selling more than 15 million copies and inspiring the popular TV miniseries of the same name.

Collins lost her husband of 26 years, Oscar Lerman, to prostate cancer in 1992. Then, in 1998, she lost her fiancé of four years, LA business executive Frank Calcagnini, to a brain tumor.

Collins continued to write after her own cancer diagnosis. Her latest, “The Santangelos,” hit bookstores in June.

“I did it my way, as Frank Sinatra would say,” she told People last week, announcing her struggle with cancer in what would be her last interview.

“I’ve written five books since the diagnosis,” Collins said.

“I’ve lived my life, I’ve traveled all over the world, I have not turned down book tours,” she said.

“Looking back, I’m not sorry about anything I did.”