The Kardashian clan is about to get even bigger -- Kim Kardashian is pregnant!

Yes, you read that correctly. The reality TV star is expecting her first child with boyfriend Kanye West.

The rapper announced the news himself during a concert Sunday night -- making the crowd go wild at the Revel Resort in Atlantic City when he said the words "Now you having my baby."

And Kim's family has already taken to Twitter to excitedly send their well-wishes to the couple, in 140 characters or less.

"Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement," Kourtney posted on her page.

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

Khloe's hubby Lamar Odom got in on the action as well, posting "I'm excited for Kanye and my sister! There's nothing like bringing life into this world! Let's keep Gods blessings coming!"

"Im a happy girl !!!!!!!!! Wowza," tweeted Kim's mom Kris Jenner. "Oh BABY BABY BABY!"

"Whos excited about the KIMYE babbyyy?! :D weeee," added Kendall Jenner.

This will be the first couple for the two, who started dating in April. According to E!, Kim is about 12 weeks pregnant.

Check out how she's been hiding her belly in the gallery below:

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