Kim Kardashian is officially pregnant with the baby of rapper Kanye West.

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The Kardashian clan confirmed the reality TV star is expecting her first baby with longtime friend and boyfriend, West, after he announced the news during his concert in Atlantic City on Sunday night, E! News reported.

The Keeping Up with the Kardashians and former Kourtney and Kim Take New York star is reportedly 12 weeks pregnant.

"Im a happy girl !!!!!!!!! Wowza!" Kardashian's mother Kris Jenner tweeted shortly after midnight Sunday night. "Oh BABY BABY BABY."

Kardashian's sisters Khloe Kardashian Odom and Kourtney Kardashian are also thrilled about the baby and publicly congratulated the pair around the same time as Jenner.

"Keeping secrets is hard with so many family members! Especially when you are so freaking excited!!!!! LOVE is everything!!!!" Khloe tweeted. "I'm excited for Kanye and my sister! There's nothing like bringing life into this world! Let's keep Gods blessings coming!"

Added Kourtney on Twitter last night, "Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement!"

Rumors that the couple had a baby on the way had first surfaced earlier this month.

Reports circulated in June that Kim -- who had divorced Kris Humphries after they split in October 2011 following only 72 days of marriage -- and West were considering moving in together. The pair were spotted together in New York City in early April catching a movie and enjoying lunch, which sparked reports they had begun dating.

Kourtney & Kim Take Miami, the third season of a Take Miami spinoff for the Kardashian sisters, began production in September and will premiere in January. 

The first two seasons of Kourtney and Khloe Take Miami, which featured Khloe instead of Kim, aired in 2009 and 2010 and were followed by two seasons of the Kourtney and Kim Take New York spinoff which aired in 2011 and early 2012.
About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.