Stars rock the MDA 'Show of Strength' concert
Credit: Mark Davis/Getty Images
LOS ANGELES, CA - AUGUST 07: Singer Amy Heidemann of the musical group Karmin performs at the MDA Show of Strength held at CBS Television City on August 7, 2012 in Los Angeles, California. The show airs on Sunday, September 2, 2012 at 8PM ET/PT, 7PM CT/MT (Photo by Mark Davis/Getty Images)
