THE 4th ON PBS

R&B legend Gladys Knight is part of the all-star lineup for Sunday's "A Capitol Fourth: America's Independence Day Celebration" on PBS . Actor Jimmy Smits will host the celebration from Washington DC. Appearing alongside Knight are country stars Reba McEntire and Darius Rucker, and "American Idol" season seven runner-up David Archuleta. PBS will broadcast "A Capitol Fourth" this Sunday, July 4th, from 7:00 p.m. to 8:30 p.m.