West shared the good news with hundreds of concertgoers during a show in Atlantic City, New Jersey on Sunday night (30Dec12), revealing Kardashian is about 12 weeks along. He told the audience to ""stop the music and make noise for my baby mama"" in reference to his girlfriend, who was in the crowd.
Members of Kardashian's family also took to Twitter.com to share their excitement - Khloe Kardashian Odom wrote, ""KIMYE!!!!! Keeping secrets is hard with so many family members! Especially when you are so freaking excited!!!!! LOVE is everything!!!!""
Her older sister, Kourtney Kardashian, who has two children with longtime beau Scott Disick, also took to the microblogging site and exclaimed, ""Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement!""
And the pregnant star's mother Kris Jenner exclaimed, ""I'm a happy girl !!!!!!!!! Wowza! Oh BABY BABY BABY.""
Kardashian is still in the middle of a bitter divorce battle with estranged husband and NBA player Kris Humphries. The pair tied the knot in August 2011, but the union lasted only 72 days.
Kardashian has been dating West since the beginning of 2012.