Common Noun:
* When referring to a person with blonde hair in general.
* Example: "The blondie in the corner caught my eye."
Proper Noun:
* When referring to the specific band Blondie.
* Example: "I love listening to the music of Blondie."
* When referring to the comic strip character Blondie Boopadoop.
* Example: "Blondie and Dagwood are classic comic strip characters."
Therefore, it's important to consider the context to determine whether "Blondie" is being used as a common or proper noun.