Abu Ja'far narrates from Sayyiduna Ali (may Allah be pleased with him): If the woman chooses herself, it is one separating (irrevocable) divorce; and if the woman chooses her husband, nothing at all is due from him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 15031