Garudapurana 3.28.41

3.28.41

kāmabhāryā ratiryā tu dvirūpā saṃprakīrtitā /
rugmaputrī rugmavatī kāmabhāryā prakīrtitā //

Rati, the wife of Kāma, is proclaimed to have two forms:
Rukmin's daughter Rukmavatī is proclaimed to be the wife of Kāma;