Judd is one of three delegates selected by party officials in Williamson County to serve in at-large positions at the convention, according to the Tennessean newspaper in Nashville. She will join delegates from all 50 states to discuss the party's platform and formally nominate President Barack Obama as the party's candidate.
Judd has a history of openly rallying behind a variety of humanitarian and social justice issues and has supported local Democratic candidates in the past.
The convention will be held in Charlotte, N.C., during the first week of September.
The Associated Press contributed to this report.