I had a friend who co-wrote a song with her fiance for their wedding. They had a very good friend perform it and rehearsed it with her so she'd do it the way they wanted. They had it announced that they had written it so everybody got how special it was without the additional stress on the bride and groom of having to perform. However, if you feel comfortable with singing at your wedding (i.e. nerves aren't a problem), I say go for it!
Jennifer
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