Karlie Kloss and Jason Wu Will Go for a Stroll on Sunday

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NEW YORK, NY - SEPTEMBER 09: Karlie Kloss and designer Jason Wu attend St. Regis Hotels & Resorts Celebrates the Announcement of Jason Wu As The Next St. Regis Connoisseur and Jason Wu's Spring/Summer 2012 Collection at St. Regis Hotel on September 9, 2011 in New York City. (Photo by Dimitrios Kambouris/WireImage for Starwood) Photo: Dimitrios Kambouris/WireImage/WireImage

The pair will participate in this year's AIDS Walk New York as co-captains of the team STEP FORWARD. You can help them raise money for AIDS organizations by donating here. Or register your own team — it's supposed to be lovely strolling weather!