The 29-year old singer reunited with Kimberley Walsh, Nadine Coyle, Nicola Roberts and Sarah Harding to kickstart the band's Ten tour, which celebrates their ten years in the industry, reported Hello! magazine.
"It was really painful but I think I�m done with tattoos now. It wasn't for any particular reason, I just liked the design. It took 15 hours in total," Cole, who has 19 other tattoos on her body, said.
"Tattoos are reflective of people's personalities. I'm always drawn to people who have them. You either like them and you're attracted to body art or you're not. I just am," she added.