Laura Marano, actress and star of the Disney Channel series Austin and Ally, has been named the 2013 Trick-or-Treat for UNICEF Ambassador. In this role, Marano will advocate, educate and fundraise for the original Kids Helping Kids® campaign, which has already raised more than $170 million since 1950 to aid children around the world. “I’m so excited to celebrate Halloween this year by encouraging kids to support UNICEF’s lifesaving work. The Trick-or-Treat for UNICEF campaign is a fun, easy way…