Kim Kardashian and Kanye West are ringing in the New Year with a new addition. 

The reality star and her boyfriend Kanye West revealed that a baby "Kimye" is on board. 

The rapper made the announcement that the two are expecting their first child at his concert Sunday night. During the middle of his performance of his song  "Lost In the World," West paused for a moment to ask the crowd of more than 5,000 at Revel Resort's Ovation Hall in Atlantic City to give a shout out to his "baby mama who was in the audience, telling Kardashian,"Now you having my baby."

The crowd roared. And so did people on the Internet.

The news instantly went viral on Twitter and Facebook, with thousands posting and commenting on the expecting couple.

Most of the Kardashian clan tweeted about the news, including Kim's sisters and mother. Kourtney Kardashian wrote: "Another angel to welcome to our family. Overwhelmed with excitement!"

One of Kardashian's closest friends, Demi Lovato, also took to Twitter to show her support. 

"So happy for you @KimKardashian," Lovato tweeted. "Love you SO much and I'm so excited to babysit!! Miss you girly.. Once again... SO happy for you!!! Xox"

The couple went public with their highly publicized romance back in March. 

Kardashian married NBA player Kris Humphries in August 2011 and their divorce is not finalized.

With reporting by the Associated Press.

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