(CNN) Kim Kardashian and Kanye West are expanding their family again.

A source close to the couple told CNN Wednesday that they are expecting their fourth child via surrogate this year.

The couple welcomed their daughter Chicago West via surrogate last January . The couple also have daughter North, 5, and 3-year-old son Saint. Us Magazine was the first to report the news.

A representative for the couple could not be reached for comment.

Kardashian West was very private when it came to the news she was expecting her third child and did not confirm that the baby was on the way until well into the pregnancy. She opted to reveal the news on her E! reality show, "Keeping Up With the Kardashians."

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