BOSTON - MAY 04: Kelly Clarkson and Lady Gaga perform at the GRAMMY Celebration Concert Tour at House of Blues on May 4, 2009 in Boston, Massachusetts. (Photo by Gail Oskin/WireImage for NARAS)
BOSTON - MAY 04: Kelly Clarkson and Lady Gaga perform at the GRAMMY Celebration Concert Tour at House of Blues on May 4, 2009 in Boston, Massachusetts. (Photo by Gail Oskin/WireImage for NARAS)