Allison Williams & Kelly Rowland: Winter Ball for Autism!

Allison Williams is a sheer classic beauty while attending the Winter Ball for Autism held at Metropolitan Museum of Art on Monday (December 2) in New York City.

The 25-year-old actress was joined by father Brian Williams and Kelly Rowland at the ball, which was hosted by Autism Speaks.

PHOTOS: Check out the latest pics of Allison Williams

Autism Speaks is an organization dedicated to funding research into the causes, prevention, treatments and a cure for autism; increasing awareness of autism spectrum disorders; and advocating for the needs of individuals with autism and their families.

FYI: Allison is wearing an Oscar de la Renta dress.

15+ pictures inside of Allison Williams and Kelly Rowland attending the Winter Ball for Autism…