"I am not my sister's keeper," Michelle told E! in a statement, "but I love her and have seen her sacrifice a lot of herself as a terrific activist." She added that they work in different ways to stop the suffering of animals, but credited her involvement in the movement to her sister.
PETA has denied involvement in the incident, but said they will "defend the activist" should any legal action be taken against her.
"If Christina Cho is the person who sprinkled flour on Kim Kardashian," said Michelle, "we know Christina as a very kind, wonderful long time volunteer."