Kim Kardashian and Kanye West Expecting First Child Together!!

What a way to welcome in the new year...

Reality star Kim Kardashian and her boyfriend Kanye West are expecting their first child together!

Although Kim is still technically married to basketball player Kris Humphris, she nows join her sister Kourtney in motherhood.

According to E! News, Kanye announced the news on stage at a concert in Atlantic City on Sunday. The rapper also told concertgoers to congratulate his "baby mom" and that this was the "most amazing thing" (Watch footage of Kanye's announcement here).

The news instantly went viral on Twitter and Facebook, with thousands posting and commenting on the expecting couple. The hashtag #Kimye took off on Twitter and was trending worldwide.

Kim's family couldn't wait to tweet about the news:

"Been wanting to shout from the rooftops with joy and now I can!" wrote Kim's sister Kourtney. "Another angel to welcome to our family. Overwhelmed with excitement!"

"KIMYE!," sister Khloe tweeted.

"Keeping secrets is hard with so many family members! Especially when you are so freaking excited!!!!! LOVE is everything!!!," she added.

The Kardashian's mother, Kris Jenner tweeted, "Oh BABY BABY BABY!!"

Other celebs are already tweeting up a storm about the news:

Ryan Seacrest tweeted, "It's true :)@KimKardashian & @KanyeWest are having a baby! congrats u guys."

"Congrats to Kim and Kanye. Happy for both of them," Russell Simmons tweeted.

Well, congratulations to the new Kardashian addition!!