The singer and the catwalk beauty ended their three-month romance last month amid reports of a series of rows.
And Campbell was reportedly furious when the publication asked her to reunite with the R&B hunk for their cover, insisting she will only attend next month's photo shoot if her pal Combs is with her, reports British newspaper The Times.
Campbell's spokesman Jonathan Morrish explains, "It was one of those things. Naomi was offered the cover. Puffy had been offered another cover.
"They are great friends, were talking the other day and, hey presto, decided to have some fun and do it together."
An insider adds, "There's no way she'd cozy up to Usher. She said she'd only do it with Diddy."
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