ORA’S NEW UNDERTAKING: Looks like songstress Rita Ora, recently cast as Mia Grey in “Fifty Shades of Grey,” has another gig: the face of the new DKNY fragrance franchise. While Aramis and Designer Fragrances — the Estée Lauder Cos. Inc. division that holds the scent license — declined to confirm, sources said Ora, spotted shooting on Seventh Avenue Monday morning, is the spokeswoman for a to-be-named women’s scent, possibly due out in fall 2014. Ora also appears in DKNY’s spring ready-to-wear campaign.