Over the Labor Day weekend Kendall Jenner stepped out in New York City to grab a smoothie, and the 18-year-old reality star/model covered up her lanky figure in a flowy white dress. For once a member of the Kardashian family isn't wearing something skintight or cut down to their navel -- shocking!

Shortly after these pics were taken, Kendall participated in the ALS Ice Bucket Challenge with a little help from pal Hailey Baldwin. Kendall was nominated two weeks ago by little sister Kylie, so we're glad she finally stripped down to a bikini and did it!

Kendall posted the Instagram video below and wrote, "thanks @nevillejacobs for the ALS ice bucket challenge nomination. I nominate @kourtneykardash @riccardotisci17 @mertalas @macpiggott." We're happy to report that she used plenty of ice and dumped the water right into the pool...