KIM KARDASHIAN: "KANYE AND I WELCOME OUR BABY BOY!"

Kim Kardashian gave birth to a bouncing baby boy over night -- with hubby Kanye West by her side at an LA-area hospital.

The reality start posted the above birth announcement on her website and a selfie on Instagram last night as contractions started, captioning the pic, "Ready when you are lol."

So no Christmas baby Yeezus for the second-time parents ... Kim's Dec. 25 due date was too late for the little boy. After recently enduring a procedure to turn the baby, who was breech, the heavily-pregnant mom was ready to pop!

The heir to the crown of cool is still without a name. He came into the work in the wee hours of Saturday morning and reports claim Kim and Kanye still haven't chosen a moniker. Let the guessing begin! ...

Khloe Kardashian couldn't wait to meet her new nephew on Saturday, Dec. 5 – the reality star headed straight to Cedars-Sinai hospital in L.A. just hours after Kim Kardashian and Kanye West's baby was born.

It's the same Los Angeles hospital where Khloe's estranged husband, Lamar Odom, has been recovering since he was discovered unconscious in Nevada brothel in October.

Khloe, 31, initially spent more than three weeks by Odom's side and has since been a constant visitor, even bringing the NBA star a home-cooked Thanksgiving meal. She was also spotted arriving at the hospital on Friday, Dec. 4, to visit Odom, hours before her big sister Kim was admitted to give birth.

"I know these hospital halls way too well," Khloe tweeted on Saturday. "Hop[p]ing from one room to another."

I know these hospital halls way too well. Hoping from one room to another.

— Khloé (@khloekardashian) December 5, 2015

Kim, 35, announced the birth of her son – her second child with West – in the early hours of Saturday morning, tweeting, "He's here!"

A statement on the reality star's website reads, "Kim Kardashian West and Kanye West welcomed the arrival of their son this morning. Mother and son are doing well."

"Invest in the brand!"