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I think the prettiest autographs are definitely Mary Costa and Amanda Seyfried. I was lucky enough to get Mary's recently and her handwriting is absolutely stunning, so princess-like!
I have to agree with other people and say that the ugliest autograph is Shia LaBeouf. It is the messiest autograph and has to be the easiest to forge as it just has nothing to it - a few lines and an S :neutral: