The Blondie singer, 64, admitted that her style was mild in comparison.
"People regarded me as overtly sexual in the '70s but what I did and how I dressed was so tame [compared] with what’s going on now," Harry told Woman and Home magazine.
"When I went into the music business there was all this sexiness about because it was anti-establishment but everything has become more extreme.
"Christina Aguilera has a wonderful voice but I don’t know whether she feels she has to compete by being so overtly sexual or whether it’s a sign of the times.”
Blondie embark on their UK tour later this month.