"Kate has blacklisted Cara now. It's very unfortunate and hopefully might be a temporary thing, but they're definitely not friends at the moment," a source said.
"Kate wasn't happy with Cara's clash with Naomi and felt she should have treated her with more respect," the source added.
Moss, 41, and Delevingne, 22, are not talking also because she the latter ended her contract with the agency, which founded their careers, reported Female First.