Well, if you’re talking about a blonde who is a woman, you put an e on the end!
The blonde wondered if her wings were noticeable.
If you are describing hair color, using blond as an adjective, then you drop the e.
The woman with the shoulder-length blond hair enjoys reading.
And finally, if you are referring to a man who has blond hair, you also leave off the e.
The blond hoped he could repair his Stradivarius.
So, you see, there are various ways to spell blond…