Monaco's late Princess Grace had an affair with her best friend's husband, a new biography claims.
Wendy Leigh alleges in her book "True Grace: The Life And Time Of An American Princess" that the actress Grace Kelly - who married Prince
Rainier III in 1956 - embarked on an extramarital fling with her bridesmaid Carolyn Reybold's husband Malcolm.
Leigh supports her claim by describing a conversation she had with legendary gossip columnist Aileen Mehle, who told her about a confessional note.
Grace - who was killed in a car crash in 1982 - wrote to Carolyn.
Leigh told the New York Post: "Aileen told me, 'In August 1960, I was at dinner and everyone was agog about the letter Princess Grace had written. It was a full confession to Carolyn, her friend and bridesmaid, telling her she loved her but she would never be happy, could never live with herself if she did not confess to Carolyn that she had had an affair with Carolyn's husband, Malcolm. She said she was sorry. She was seeking expiation.' "
According to Leigh, Carolyn has confirmed she received the note and says she had forgiven the princess.
Leigh claims it was her father's illness that pushed the princess into the arms of her friend's husband.
She said: "At that time, Grace's father was on his deathbed. I believe that Grace became virtually unhinged by grief at the prospect of losing him. As to her affair with Malcolm, wrong as it was, I believe that she succumbed to Malcolm, an accomplished seducer, at a time when she was vulnerable in the extreme."
The book also suggests that Grace's infidelity stretched beyond her relationship with Malcolm and she had illicit affairs with Marlon Brando and Frank Sinatra.