Keane will be the director in charge of the as-yet-unnamed operation, which will launch within the next two months.
The move is part of Publicis' bid to establish itself further in the female health and interest market that incorporates luxury products.
It already holds the advertising accounts for the beauty specialists L'Oreal, Cacharel fragrances and the cosmetics brand Helena Rubinstein, among others.
Keane will work to develop a new-business offering that understands women's needs and maximises how brands can talk to female consumers.
Grant Duncan, the chief executive of Publicis, said: "We are delighted to have someone of Miriam's calibre joining us. She has an excellent intuition for female markets and will help Publicis to develop further in that area."
Jordan Keane arrives following a three-year spell at Bates, where she was the client services director.
Before that she was employed by Young & Rubicam, which she joined from Grey, where she ran its SmithKline Beecham business in the UK. Before that, she was at Saatchi & Saatchi where she was an account director on Procter & Gamble's beauty division until 1996.
She said: "This is my dream job. Female issues is an area I have been interested in throughout my years in the industry and I am excited at the opportunity Publicis has given me."