Kanye West delivered what may be the last big, shocking news of 2012 -- he and girlfriend Kim Kardashian are expecting a child.

West dropped the bombshell during his Atlantic City concert Sunday night. He not so subtly sang "Now you having my baby" to the crowd of about 5,000. In case that wasn't clear enough, he then asked fans, "Can we make some noise for my baby mama right quick?" according to an Associated Press report.

TMZ adds that Kardashian sources say the reality TV star is 12 weeks pregnant.

Apparently, West, 35, stole Kardashian's thunder with the news. She reportedly said after the concert, which she was attending, that she had no idea West would spill the beans. We can only imagine how the TV producers for "Keeping Up With the Kardashians" feel this morning.

Kim Kardashian, derecha, habla mientras el rapero Kanye West, izquierda, la escucha antes de un partido de la NBA entre el Heat de Miami y los Knicks de
Kim Kardashian, derecha, habla mientras el rapero Kanye West, izquierda, la escucha antes de un partido de la NBA entre el Heat de Miami y los Knicks de Nueva York en esta fotografía de archivo del 6 de diciembre de 2012, en Miami. West anunció en un concierto el domingo 30 de diciembre de 2012 que su novia Kardashian está embarazada. (Foto AP/Alan Díaz, archivo) (Kim Kardashian, derecha, habla mientras el rapero Kanye West, izquierda, la escucha antes de un partido de la NBA entre el Heat de Miami y los Knicks de Nueva York en esta fotografía de archivo del 6 de diciembre de 2012, en Miami. West anunci&#)

After West's big reveal, Kardashian, 32, blogged about the happy news, which included an emotional wish regarding her late father, Robert Kardashian, who died of cancer in 2003, and West's late mother, Dr. Donda West, who died five years ago from complications after plastic surgery.

"We feel so blessed and lucky and wish that in addition to both of our families, his mom and my dad could be here to celebrate this special time with us," she wrote. "Looking forward to great new beginnings in 2013 and to starting a family."

The couple publicly announced they were dating in April, six months after Kardashian filed for divorce 72 days after marrying Kris Humphries. The divorce is still pending -- but looks like Humphries has a new bargaining chip to bring to the table.

Kardashian is expected to ring in the new year at 1 Oak in Las Vegas. She reportedly will receive a six-figure appearance fee at the event, which costs $3,000 for a table and $125 to stand.

It didn't take long for the Kardashian clan to jump on the baby news via Twitter.

Sister Khloe Kardashian wrote, "Keeping secrets is hard with so many family members! Especially when you are so freaking excited!!!"

"Oh BABY BABY BABY!!" added mom Kris Jenner.

And sister Kourtney Kardashian chimed in with, "Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement!"