The photo shows Kardashian wearing a white wedding-style dress with West's arms around her. She posted it on her official Twitter and Instagram accounts saying: "This is such a dream come true!!!" West wrote "Thank you voguemagazine" on his Twitter account.
West has said he believed Kardashian is cover-worthy. In a radio interview with Ryan Seacrest last October, he said "there's no way Kim Kardashian shouldn't be on the cover of Vogue." He also said Kardashian was more influential than first lady Michelle Obama in her clothing choices.
However, in the magazine, which hits stands March 31, Vogue editor in chief Anna Wintour told readers it was the magazine's idea to feature Kardashian, and the decision was based on the reality starlet's dominance - and was not influenced by her famous boyfriend.
"You may have read that Kanye begged me to put his fiancee on Vogue's cover," Wintour wrote. "He did nothing of the sort. The gossip might make for better reading, but the simple fact of the matter is that it isn't true."
The couple are the parents of 9-month-old daughter North.