It's finally happened, y'all! Kim Kardashian is pregnant with boyfriend Kanye West's baby! (Guess this is what Kim was referring to when she told us Friday she has "big plans" for New Year's Eve.)

The rapper took the opportunity to announce the news Sunday night at his Atlantic City concert, telling the audience: "stop the music and make noise for my baby mama," referring to Kim, who was in the audience. Awww, how sweet; his first baby mama reference!

Kim's family, of course, Tweeted their congratulations. Kourtney wrote: "Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement!"

Khloe Tweeted: "Keeping secrets is hard with so many family members! Especially when you are so freaking excited! Love is everything!"

This is the first child for both - Kanye, 35, and Kim, 32, began dating earlier this year after Kim filed for divorce from Kris Humphries following a 72-day marriage. Kim was previously married to music producer Damon Thomas in 2000 and the pair divorced four years later.

Is Kanye predicted in his single "White Dress" that he and Kim may be the next to walk down the aisle? Kim'll have to settle her divorce from Humphries first -- they're still legally married!