^She performed the Hot Stuff remix on the JAPONESQUE Tour, although she did more dancing than singing. xD But yeah she hasn't performed the full original song in a while. Which is a shame cause it's an awesome song! I really loves that she performed the JUICY remix on the tour, too, even though it was only a short version.
She does seem to have gone for a more liberating urban style since her comeback, I like it.
EDIT: Got an E-mail from Kuu today with the Official E-Mail Magazine about her concert in Taiwan! Her messages are adorable. <3