Guess Which Kardashian Sister is Pregnant!

Kim Kardashian and Kayne West are expecting their first child together. Kanye made the announcement Sunday night during a concert in Atlantic city. Kardashian's sisters and their mom also tweeted the news. It's believed Kim is about three months pregnant. As you may recall, Kim married NBA player, Kris Humphries last year for a whopping 72 days. Their divorce is not yet final.