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"Congrats to this beautiful couple. I love you guys," tweeted one of Kim Kardashian's sisters, Kylie Jenner, following news that the reality star and boyfriend, Kanye West, are expecting their first child. Instagram

Kim Kardashian and Kanye West are expecting their first child together.

Gossip website Just Jared confirmed the news with Kardashian's reps after West excitedly announced their bundle of joy during his Dec. 30 concert at Revel in Atlantic City.

The performer halted mid-song and said, “stop the music and make noise for my baby mama,” reportedly pointing to Kim, who was sitting in the audience.

The high-profile couple have been dating since April 2012, according to the Huffington Post. The pair connected while Kardashian was in the midst of a divorce from Brooklyn Nets forward Kris Humphries, who she married in August 2011 and split from just 72 days later.

Since then, the couple has often been spotted out together, including on Christmas Day, when they attended the Los Angeles Clippers game.

Pregnancy rumors surfaced when gossip website Media Takeout reported that Kardashian and West were seen outside of a popular OB-GYN office in Beverly Hills last week.

E! News suggested that Kardashian is about 12-weeks pregnant.

Kardashian's family has already taken to social media, expressing their excitement over the news, seemingly all tweeting at the same time.

"Oh BABY BABY BABY!!," tweeted Kim's mother, Kris Jenner, early Monday morning.

"KIMYE!!!!! ... Keeping secrets is hard with so many family members! Especially when you are so freaking excited!!!!! LOVE is everything!!!!" tweeted younger sister, Khloe Kardashian.

Later, she retweeted congratulations from her husband, Los Angeles Clippers forward, Lamar Odom, who said, "I'm excited for Kanye and my sister! There's nothing like bringing life into this world! Let's keep Gods blessings coming!"

Her older sister, Kourtney Kardashian, tweeted, "Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement!" Meanwhile, another sister, Kendall Jenner, tweeted "whos excited about the KIMYE babbyyy?! :D weeee."

The youngest sister, Kylie Jenner, tweeted, "Congrats to this beautiful couple. I love you guys," alongside a photo of Kardashian and West.

Kardashian has yet to comment about the pregnancy herself.

[UPDATE]

Kim has now opened up about her pregnancy on her website.

“It’s true!! Kanye and I are expecting a baby,” she wrote. “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. Looking forward to great new beginnings in 2013 and to starting a family. Happy New Year!!! Xo”