Kanye made this surprise announcement last night while performing at Revel in Atlantic City, New Jersey. Kanye said:
"Stop the music and make noise for my baby mama," referring to Kim, who was in the audience.
Shortly after Kanye shared the news, Kim's sisters, Khloe and Kourtney expressed their happiness via Twitter.
Kim is reportedly 12 weeks pregnant. So happy for her. Congrats to them!