Priscilla Presley, the ex-wife of the late Elvis Presley, celebrated her 80th birthday on Saturday, May 24. To mark the milestone, her granddaughter Riley Keough shared an Instagram Stories post featuring a throwback photo of Priscilla posing in the driver's seat of a car, wearing a floral-inspired headband in her hair. "HBD queen," Keough, 35, wrote.

Priscilla's son Navarone Garibaldi Garcia, 38, previously shared a tribute earlier in the month, posting a heartfelt message on Mother's Day. "Happy Mother's Day to my whole world. I love you mama," he wrote.

Priscilla's birthday celebrations come a month after she revealed that she will be releasing a new memoir, Softly, As I Leave You: Life After Elvis, on September 23. The book, co-written with Mary Jane Ross, is centered on the "deeply personal story" of what Priscilla "lost and what she found" as she discovered who she was apart from her first love, Elvis.

The memoir will also look at how Priscilla reinvented herself after Elvis' death as a single mother raising their "talented" and "often headstrong" daughter Lisa Marie Presley — and then again as the mother of Garcia, whom she welcomed with music producer Marco Garibaldi in 1987.

Meanwhile, Riley Keough reflected on the Presley family curse, being the sole heir of Graceland, in a previous interview. "This book covers eight decades of my life," Priscilla said in a statement. "Writing it has been a learning process on many levels. I have reflected deeply both on myself and on those I love."

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