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The "Britain's Got Talent" star made the announcement Sunday with the UK Guardian ... telling them her diagnosis was a relief -- because people will finally get a "greater understanding" of who she is.
Susan says she struggles with relationship and communicative difficulties -- but getting a grasp on her Asperger's will help her deal with those sitations better.
For those unaware -- Asperger's is a mild form of autism.
Susan adds, "Now I have a clearer understanding of what's wrong and I feel relieved and a bit more relaxed about myself."
