The Cougar Town actress's child, Coco, is dressing up as half-angel/half-devil on Wednesday and Cox thinks the costume suits the youngster's personality perfectly.
She told People: "This Halloween she's going to be a half-angel, half-devil... She is half-devil and half-angel, so I thought [the costume] was just typecasting for her. She just really has a big heart, and she's 8, not mischievous, but she's bold."
The 48-year-old star quipped that she is convinced her ex-husband David Arquette's genes are to blame for their daughter's wilder side and her eccentric choice of fancy dress.
She said: "At one point she wanted to be a baby-old man detective and she had this whole outfit planned out... She had a bib, she had a moustache, glasses, a pacifier, and I was like, 'That's very David, isn't it?' To just come up and be that creative.
"I see a lot of both of us in Coco, for sure. She's very, very split down the middle between the two of us, and Coco is really, really, really creative."