K-I-S-N-G

The last month or so Addison has learned the song "_____ & Addison kissing in a tree" but this is the part that makes me crazy-- she sings "K-I-S-N-G".  I told her that not really how it goes and have been trying to teach her to spell "K-I-S-S-I-N-G" but she insists that since I'm from Wisconsin, but she's from Minnesota that they do it differently.  And in MN-- or at least MN people sing the song "K-I-S-N-G"