There's something about Kylie's smile that is contagious, dontcha think? She was in New York City today representing DKMS, an association that helps raise awareness for the need for people to come forward to become donors.

She started her day attending the lighting ceremony at the Empire State Building, the tower shone red and white in honour of the Coty/DKMS Linked Against Leukemia Partnership. She wore a very black & very lacy dress, check out the view of the back! Wow.

She wrapped up her day in New York City attending DKMS's 3rd annual gala event at Cipriani 42nd Street, and was joined by Rihanna, who is actively involved in the charity as well (quite a fashionable duo this evening). Kylie wore a plummy gown that looks like Lela Rose Fall 2009.

Check out the gallery below, Kylie looked just radiant!