Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved

Late Show with David Letterman

Jason Aldean performs on stage in the Ed Sullivan Theater in New York City as part of CBS' "Live on Letterman" concert series, Wednesday Sept. 5, 2012.
Photo: Jeffrey R. Staab/CBS
©2012 CBS Broadcasting Inc. All Rights Reserved