RALPH’S NEW FACE: Polo Ralph Lauren has signed an exclusive worldwide contract with Tanga of Click Model Management. The 19-year-old Belgian will represent Polo Ralph Lauren apparel and Ralph Lauren Fragrances. Tanga is featured in the fall ’97 ad campaigns for Ralph Lauren Collection and Polo Jeans, and also appears with Tyson Beckford in the Polo jeans promotional film in Sony Theaters. Polo already has Matt King, Beckford and Bridget Hall under exclusive contracts.

NEW TWIST FOR SAKS: Rather than send the usual couture catalog to its top customers, Saks Fifth Avenue mailed a 6 1/2-minute video, shot by Patrick Demarchelier, that shows three short vignettes and live footage from the runway.
The work of some 44 designers is represented, including Yves Saint Laurent Rive Gauche, Giorgio Armani, Gucci, Donna Karan Collection, Gianni Versace, Prada and Jil Sander.
The video, created by Michael Matthews, vice president of creative at Saks, will be accompanied by a designer catalog depicting all the outfits on mannequins. Ten thousand videos and catalogs were sent to customers.
Saks has begun an outdoor campaign in New York on telephone kiosks, commuter rail platforms and Super King buses featuring images of Nathan Lane and Christine Baranski and the tag line, “Defining Style.”

DOING LAUNDRY: Laundry by Shelli Segal has taken its first plunge into TV advertising. The contemporary firm, a sponsor of the VH1 Fashion Awards, began running a 30-second spot this week on VH1, said Mark Mendelson, executive vice president. The awards event is set for Oct. 24.
The ad features model Olivia Chantecaille dressed in Laundry’s miniskirt and striped sweater. She’s shown shopping at Laundry’s in-store boutique at Bloomingdale’s.

NEW PR POSTS: Christina Campanaro Juarez has been named vice president of public relations for Christian Dior Inc. She will head the new publicity and special events department that is part of Dior’s plans for U.S. expansion and growth. Juarez reports to Thierry Letrilliart, president and chief operating officer of Christian Dior.
For six years, Juarez has been president of her own company, Christina Juarez & Associates, a public relations, special events and show production agency. Diane Terman Public Relations has inherited the bulk of Juarez’s client list.
Molly Laub, director of Giorgio Armani Editorial, has been promoted to the new post of director of special projects. Succeeding Laub is Guillermo Zalamea, fashion editor of Esquire.
Laub will be responsible for coordinating all efforts between the company and the entertainment, music and sports industries. Zalamea will be liaison between Armani and fashion editors at women’s and men’s magazines. Both report to Linda Gaunt, director of public relations.

A LOOK AT LEVI’S: The Art Director’s Club in New York will unveil “This Is a Pair of Levi’s Jeans,” a visual retrospective of Levi Strauss & Co.’s 150 years of TV and print advertising and graphic design.
The retrospective opens Oct. 10 and runs through Oct. 31 at 250 Park Avenue South. A highlight of the exhibit will be the first public showing of the two oldest pairs of Levi’s jeans in the world.

BARNEYS GIG: Barneys New York will supply the wardrobe for Katherine Linton, the host and senior producer of “In the Life,” a PBS news magazine covering the lesbian and gay community.

JACOBY PROMOTED: Stephen Jacoby has been named vice president of marketing and database at Conde Nast. He had been corporate marketing director for four years.