Celeste Katz and Dave Goldiner have the scoop in The Daily News - JFK intern admits all:
The then-Mimi Beardsley was a senior at Miss Porter's School in Connecticut when she came to the White House in 1961, months after Kennedy became the youngest elected President in history.Ruh Oh!
The editor of her school paper, Mimi was invited to Washington to interview Jacqueline Kennedy, who had graduated from the exclusive girls' boarding school.
She never met the First Lady but quickly captured the attention of the world's most powerful man.
A year later, Mimi was awarded a prestigious internship in the White House, though she couldn't even type.
...
The striking teenager was invited to White House pool parties with a handful of other young women and flown on Air Force jets to secret liaisons with Kennedy at resorts and summit meetings, Gamarekian said.
Once, presidential aides caught her hiding on the floor of a limousine in JFK's entourage in the Bahamas moments after the President left.