The two have been dating for about eight months. They've denied pregnancy rumors in the past, but a spokesman for Kardashian confirmed the news to CNN. West made the announcement at a Sunday show in Atlantic City, New Jersey.
The Monday morning tweets spread fast from Kardashian family members, including Kim's mother and sisters. Kim Kardashian is still legally married to N-B-A player Kris Humpries, although she filed for divorce in October 2011, 72 days after the two were wed.