Frank Sinatra, Ava Gardner, and Nancy Sinatra
Frank Sinatra was still married to Nancy Sinatra when he first laid eyes on Ava Gardner, but that didn't stop the two from engaging in a passionate love affair. Although Frank was known to be unfaithful, something about his relationship with Ava seemed different.
He left Nancy in 1951. Only a few days after the finalization of their divorce, Frank was ready to tie the knot with Gardner. However, a few days prior to the wedding, Ava received an anonymous letter stating that Frank had been cheating on her for months. She was furious but went through with the wedding regardless.