After four years of marriage, Carrie Underwood still doesn’t know her husband Mike Fisher’s Twitter handle. E! News reports that Underwood took to the social media platform on Thursday to which her hockey player a happy fourth wedding anniversary -- but tagged @mikefisher instead of his real handle @mikefisher1212. The country artist quickly caught herself and updated her message to read, "Four years ago today, I married my best friend. Happy anniversary @mikefisher1212 The best is yet to come and I can't wait!" Thank goodness for that delete button!