Ariana Grande's scalp is still impacted ... I want to play Cat Valentine so blue mohawk, sign me up.'" Ariana rocked red hair for the duration of her time on Nickelodeon between 2010 and 2014.

Ariana Grande is going back to her ... that was and how it tied into her role as Cat Valentine on Sam & Cat on Nickelodeon. "I had to bleach my hair and dye it red every other week for the first ...