The Oscar winner was the guest of honour at the "lovely, spiritual" ceremony between the 41-year-old moviemaker and her partner, Paul Van Waggoner, in St. Tropez.
In a touching post on her blog, accompanied by several personal photographs, Fonda writes, "We had three days of wonderful fun, food, friends, ex-husbands, families of ex-husbands, former wives of ex-husbands, perfect weather, time to cruise the port and back streets of St Tropez.
"I cried a lot seeing my daughter so happy. And all of us are crazy about Paul Van Waggoner, the handsome and kind groom.
"I return to Paris tired and relieved that it all went so well (with no effort on my part, I have to add) and without any meltdowns."
Vanessa is Fonda's daughter with her late first husband Roger Vadim. They wed in 1965 before splitting in 1973. Vadim died in 2000.