Araneus pegnia
Sometimes called the "Butterfly Orbweaver" because of the butterfly pattern on the abdomen.
Dorsal View
ID courtesy of John and Jane Balaban (www.bugguide.net)
Auburn, Alabama
For more information on this spider, see: http://www.bugguide.net/node/view/39390
Also, a great review by Eric Eaton at:
http://bugeric.blogspot.com/2012/10/spider-sunday-butterfly-orbweaver.html