Kim Kardashian and Kanye West are expecting their first child together, the rapper announced during a Sunday, Dec. 30, concert in Atlantic City.

In front of more than 5,000 fans at his concert at Revel Resort's Ovation Hall, West, 35, made the announcement while singing "Now you having my baby," according to the Associated Press. He then asked the audience to congratulate his "baby mom," saying the pregnancy was the "most amazing thing."

Kardashian is 12 weeks along, according to TMZ.

Watch the video of his announcement here.

West's Sunday concert was his third consecutive performance at Revel. He was on stage for nearly two hours, performing hits like "Good Life," "Jesus Walks" and "Clique."

Though they cannot legally get married until Kardashian finalizes her divorce from NBA player Kris Humphries, an insider said the reality star and West hope to get married soon, and in England of all places. Kardashian is a fan of the Duchess of Cambridge Kate Middleton, and she wants her own wedding to West to be just as royal and lavish and Middleton's nuptials with Prince William.

Kardashian, 32, and West went public with their relationship in April, while the reality television star's divorce from Humphries was still pending. They divorced in August 2011 but the paperwork is still not complete.

She told "The View" panel earlier in Decemeber that starting a family is a goal of hers.

"Kids is definitely something I want," she said. "I think I wanted that before."

West and his girfriend have been very public about their relationship. Kardashian tweeted personal photos taken during her vacation in Hawaii with West, including a close-up shot of the couple on the island, where the rapper was recording his next album.

Kardashian also spoke about their relationship on Oprah Winfrey's "Oprah's Next Chapter," saying the following:

"I don't know why it took us so long to get together... I think we've always had an attraction to each other but we've always been in other relationships or it wasn't the right timing. And one day it just happened. It took me by surprise."

Also being vocal about his relationship status, West dedicated his song "Cold" to his girlfriend, by rapping, "I'll admit I fell in love with Kim.. Around the same time she had fell in love with him," referring to Humphries.

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Kim Kardashian, Kanye West