Former U.S. Presidents Bill Clinton (3rd L), Jimmy Carter (L), George. H.W. Bush (C) and George W. Bush (2nd R) attend the "All Together Now - A Celebration of Service" at the John F. Kennedy Center for Performing Arts in Washington March 21, 2011. They are joined by Rosalynn Carter (2nd L), Barbara Bush (3rd R) and Laura Bush (R). REUTERS/Jim Young (UNITED STATES - Tags: POLITICS ENTERTAINMENT)