The Barbarella star, 72, underwent surgery earlier this month (Nov10) to remove a lump from her breast after doctors discovered a small "non-invasive" tumour during a routine check-up.
The Oscar winner is now cancer-free and the health crisis has prompted her to seal her romance with music producer Richard Perry, who supported Fonda throughout the traumatic experience.
The couple, which became engaged in 2009, was said to have called off its wedding plans earlier this year (10), with the actress telling TV talk show titan Oprah Winfrey in October (10), "I'm not going to get married again."
But Fonda has been overwhelmed by Perry's devotion to her during her health struggle and they are preparing to exchange vows in 2011, reports the National Enquirer.
A source tells the publication, "Richard has been a rock. He stuck by her side through the whole ordeal and promised to take care of her, no matter how serious the situation turned out to be.
"Seeing Richard step up to the plate made Jane realise he is truly the man for her... The cancer changed Jane's priorities. He's the man of her dreams, and Jane wants to be with him for the rest of her life."
Fonda has been married three times before - to late French director Roger Vadim, former politician Tom Hayden and media mogul Ted Turner.