It seems Naomi was playing by the ol' if you don't have anything nice to say don't say anything at all motto.
When one of the hosts asked Naomi what she made of the cover, she simply smiled and said: "I do not want to comment." She could well have saved face if she didn't then laugh her head off.
The host then followed up by asking if she thought "Kim and Kanye haven't earned the right to be on the cover of Vogue?"
"Those are your words, not mine," she added. "I'm being politically correct."