Kendall Jenner celebrated Valentine's Day weekend working with designers Alexander Wang and Diane von Furstenberg. On Saturday, the 19-year-old model was spotted strutting down the runway at NYC's Lincoln Center in a grungy, black two-piece ensemble with fringe and platform shoes from Wang's Spring collection. The following day she returned to the runway and modeled a black-and-white wrap dress at von Furstenberg's New York Fashion Week show. The "Keeping Up with the Kardashians" star kicked off her modeling career last year when she walked the runway for fashion houses including Chanel, Marc Jacobs and Fendi. In 2015, Jenner has appeared in ads for Estee Lauder, for which she is brand ambassador, and starred in campaigns for Marc Jacobs and Karl Lagerfeld.