When Kanye West spilled the beans last week that he and girlfriend Kim Kardashian were expecting their first child, the whole world was caught by surprise. Well, everyone that is, except Kim’s famously tight-knit family, who took to Twitter to share their joy, while expressing relief they no longer had to keep such a major secret to themselves.

“Been wanting to shout from the rooftops with joy and now I can,” big sis Kourtney tweeted. “Another angel to welcome to our family. Overwhelmed with excitement!”

So how and when did Kim break the news to her clan? We asked a Kardashian family friend, who gave us the answer.

“They did it on Christmas Eve, at Kris and Bruce’s house,” the friend tells Wetpaint Entertainment. “The whole family was there, plus Kanye of course. They told them that night.”

“Everyone was over the moon,” the friend continues. “But they knew they had to keep it a secret until Kim and Kanye were ready to announce it publicly.”

The friend adds, “They did an amazing job of it, I’ll tell you that. No one else had any idea. Not her friends, not his friends, no one. The family knew…but the rest of us found out the way everyone else did, in the news.”

Job well done, Kardashians. But we have to ask: What else are you keeping under wraps?