Hans Christian Andersen. "The Ugly Duckling". Good story, but the whole "It's alright because he would grow up to be pretty!" was...unfortunate. Then a conversation on this very wiki pointed out that ducks were quite cute, and it was a matter of opinion. I also looked up baby swans (they're technically cygnets). They're really cute. The point wasn't that the "duckling" grew up and became beautiful, it was that the swan, with the benefit of looking like what he was, found people who accepted him.
In other words, the ugly duckling is one of the oldest examples of Hollywood Homely.