Jealous Kris Jenner is seething over Priscilla Presley dishing about her long-ago affair with Robert Kardashian Sr. in her new memoir, as the reality TV matriarch suspects Elvis Presley 's former wife was the true love of her ex-husband's life, RadarOnline.com can reveal.

Priscilla, 80, dated the lawyer from 1975 to 1976 before he married Jenner, now 69, and fathered her famous Kardashian children — Kourtney , Kim , Khloe and Robert Jr. Article continues below advertisement

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Despite divorcing the King of Rock 'n' Roll in 1973, Priscilla revealed in the tell-all Softly, As I Leave You , Elvis once p

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