In Spencer, Diana is horrified (though seemingly unsurprised) to discover her husband gave her the same pearl necklace he gave to his then-mistress, Camilla Parker-Bowles. There's no evidence to suggest this gift-giving snafu ever happened (or that she ate them at the dinner table). What is true to life, however, is that Prince Charles's affair with Parker-Bowles was, indeed, a primary source of contention within their marriage.