It’s true: Kimye is reproducing.

Kanye West announced during a concert on December 30 in Atlantic City that his girlfriend, reality TV star Kim Kardashian, is pregnant with their first child. Her rep later confirmed the news.

The baby news quickly lit up Twitter, where #Kimye became a trending topic and Kardashian’s family, including her famous sisters Kourtney and Khloe, chimed in with their congratulations. “Been wanting to shout from the rooftops with joy and now I can!” tweeted Kourtney, herself a mom of two. “Another angel to add to our family. Overwhelmed with excitement!”

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West, 35, and Kardashian, 32, began dating in April, a few months after Kardashian filed for divorce from her husband of just 72 days, NBA player Kris Humphries. That divorce is not yet final.