The rapper announced the news at a concert in Atlantic City on Sunday night.
He told the crowd of more than 5000 at the Ovation Hall at the Revel Resort in song form: "Now you having my baby."
According to reports Kim Kardashian is twelve weeks along in her pregnancy.
The couple have been dating since April 2012.
The tweets of congratulations have already started to pour in for the happy couple.
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Kim's sister Khloé Kardashian Odom wrote, "Keeping secrets is hard with so many family members! Especially when you are so freaking excited!!!!! LOVE is everything!!!!"