Kim Kardashian says baby No. 3's name is Chicago West.

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The 37-year-old "Keeping Up with the Kardashians" star shared the news in a post on her website Friday after welcoming a daughter via surrogate with husband Kanye West.

"Chicago West," she wrote, adding her baby girl's birthdate and weight.

Kardashian announced Tuesday that her surrogate gave birth to a 7lb, 6oz infant Monday, Jan. 15.

She already shares 4-year-old daughter North West and 2-year-old son Saint West with West.

"The baby is home now with mom, dad and her big sister and brother and enjoying their time as a family bonding with the baby," a source told E! News this week.

Kardashian addressed her decision to use a surrogate in a post Thursday, saying she "instantly" bonded with her daughter.

"The connection with our baby came instantly and it's as if she was with us this whole time," she gushed.