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Kanye West announced Kim Kardashian's pregnancy in a BIG way on Sunday night -- but the reality star has been hiding the news for almost 3 months!

Kim is reportedly 12 weeks along, meaning she should be starting to show.

So how has she kept it hidden until now ... just check out her clothes!

While the 32-year-old kicked off pregnancy speculation when she sported an ill-fitting crop top in Miami earlier this month, she's been keeping covered up every since.

Lately, she's only been seen out sporting baggy clothes and very big jackets ... and holding her hands over her stomach.

It also helped that her huge family kept their traps shut.

"Been wanting to shout from the rooftops with joy and now I can," an excited Kourtney tweeted once the news was finally revealed. "Another angel to welcome to our family. Overwhelmed with excitement,"

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

The congratulations didn't stop there.

"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 -- while Khloe's hubby Lamar Odom tweeted "I'm excited for Kanye and my sister! There's nothing like bringing life into this world! Let's keep Gods blessings coming!"

This is the first baby for Kim and Kanye. See her pregnancy style (so far) in the gallery above.

And we're sure she'll be working that baby bump when she hits the red carpet for her big New Year's Eve bash Monday night at 1 Oak in Las Vegas. Be sure to check back for those pics tomorrow!

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