The pregnancy was revealed by Kanye West onstage during a concert in Atlantic City on Sunday night as Kim Kardashian watched.
The rapper said “stop the music”, then announced “make noise for my baby mama right here”, with a wide smile. Kanye West’s announcement prompted a flurry of excited tweets from the audience.
The two have been dating for eight months. They have previously denied pregnancy rumors.
Kim Kardashian is thought to be around the 12-week mark.
KimKardashian, 32, and Kanye West, 35, were last seen together on Christmas Day when they attended a basketball game to watch Kim’s brother-in-law Lamar Odom play with his new team The Clippers.
Kanye West was seen carefully attending to his girlfriend and holding her hand as they sat side by side in the front row. They left at half time, with Kim Kardashian later tweeting that she felt “unwell”.
“In bed with the flu all day. Praying this goes away fast!” the Keeping Up With The Kardashians star wrote.
Kim Kardashian is still married to her estranged second husband Kris Humphries. The pair’s divorce has been prolonged as the basketball star has insisted on a court case, claiming the marriage should be annulled as it was “fraud”.
After the news of Kim Kardashian’s pregnancy broke late on Sunday her excited family took to Twitter.
Sister Kourtney Kardashian wrote: “Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement!”
And little sister Kendall Jenner added: “Whos excited about the KIMYE babbyyy?! 😀 weeee.”
Khloe Kardashian wrote: “KIMYE!!!!! Keeping secrets is hard with so many family members! Especially when you are so freaking excited!!!!! LOVE is everything!!!!”
Khloe Kardashian‘s husband Lamar Odom tweeted: “I’m excited for Kanye and my sister! There’s nothing like bringing life into this world!
“Let’s keep Gods blessings coming!”
And Grandma-to-be Kris Jenner added: “I’m a happy girl !!!!!!!!! Wowza!”
Kanye West spent the Christmas period with Kim Kardashian’s family, who have welcomed him with open arms.
Kim Kardashian has also become close to Kanye West’s family after being he took her to visit them in Oklahoma City while visiting his mother Donda West’s grave last month.
Since Kim Kardashian and Kanye West began dating in April they have rarely been apart.
Despite the shortness of their relationship, the two have been friends for years.
It has even been speculated that the rapper had been in love with Kim Kardashian back in 2009, when he appeared to refer to her in his track Knock You Down.
At the time the song was penned, Kim Kardashian was in a relationship with NFL star Reggie Bush, whom she went on to date on and off for three years.
The song includes the lines: “You was always the cheerleader of my dreams… To seem to only date the head of football teams… And I was the class clown that always kept you laughing… We were never meant to be, baby we just happened.”
He then goes on to rap: “You should leave your boyfriend now.”
And in December 2010, Kanye West was on hand when Kim Kardashian filmed her music video Jam (Turn It Up).
In scenes later broadcast on her reality show Kris Jenner was seen jokingly criticizing Kanye West for eyeing up Kim Kardashian, telling him: “Don’t be looking at her a**.”
Not one to miss a beat, quick-witted Kanye West replied: “I’ve never seen it actually.”
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