While playing the role of Abby, Pauley Perrette ensured that the original color of her hair stayed hidden, and she stayed true to her character. Perrette is a natural blonde, so she kept dyeing her hair during her time with "NCIS" to keep up with her role. But black hair was something she'd always liked, even before even joining the show.

"I actually dyed my hair before NCIS. I did it by myself — that wasn't for Abby. But I always wanted black hair. I can't remember when I first dyed it black. I was on another TV show, and they dyed it blonde and all of my hair fell out. It was bad. I had really short blonde hair for a while, but as soon as that show was canceled, I was back in black," Perrette said (per Parade).

Turns out, the regular dyeing took a toll on her scalp health. "[I] started getting a little irritation. I didn't figure out that it was from hair dye because I had been doing it for so long. And then I kind of started associating, and I was like this has something to do with hair dye. I didn't worry about it too much," Perrette said in a 2015 interview with Queen Latifah, adding it was a case of PPD allergy — an acquired allergy in those who have been dyeing their hair for a long time. Now, that's some dedication to a role!

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