From Wikimedia.
This and the next portrait of Infanta Isabel Clara Eugenia are similar, but not the same and the dress is similar, but not the same.
Keywords: 1609, Rubens, Infanta Isabel Clara Eugenia, Princess, Spanish, Habsburg family, straight coiffure, jeweled floral headdress, high enclosing neckline, lace neck ruff, lace, surcote, hanging sleeves, bodice, long false sleeves, lace cuffs, full skirt, draped necklace, earrings, jeweled crucifix, handkerchief