Advice needed-How to tell mom and stepdad that name change went through?

About a month ago, I talked to my mom and step-dad about me getting a name change. I wanted my name changed to where my last name would be the same as theirs. I am in my early 20s and wanted to do this for a long time (decade or so) but never had the money or found a lawyer who would do it for a reasonable price in our area. (In our area, the county and state that we live in requires you to retain legal counsel to do this. There aren't any do it yourself options). Anyways, the name change went through last week and yesterday I received the court documents in the mail. I just didn't know how to go about telling them about it. It's not that it is a shame thing or something I wasn't supposed to do, but I just lack the ability to be able to break news in general to people. I am not good at that for some reason. I was going to tonight, if they are still up after I get home from night school. Suggestions, advice please??