Jackie Kennedy and Lee Radziwill
They were both stylish, beautiful women, and sometimes attracted to the same men. Jackie and Lee had it all as young girls, but both wanted to have more than the other.
The sisters were always determined to out-do one another, so while one married a President, the other bagged the Prince Polish Prince Stanislaw Albrecht Radziwill. Their rivalry started from the beginning, there was tension between the two since they were very young. While their father doted on Jackie, even naming her after himself, their mother made it clear that the younger sister was her favorite.
According to one recent biography, Lee may even have slept with JFK while the two married couples were on holiday one time.
