Khloe Kardashian Visits Hospital As Family Celebrates Birth of Kim Kardashian and Kanye West's Son

The Kardashian krew has just grown by one, and the first family of reality TV couldn't be happier!

Kim Kardashian gave birth to her and husband Kanye West's second child, a boy, in Los Angeles on Saturday, and her loved ones took to social media to welcome the new addition.

WATCH: Kim Kardashian Gives Birth to Baby Boy

Kim's oldest sister, Kourtney Kardashian, sweetly tweeted, "Baby’s breath," along with a blue heart and praying hand emojis.

Younger sister Khloe Kardashian, a familiar face around Cedars-Sinai Medical Center lately, was actually the first to tweet from the hospital. As she has frequently visited the Beverly Hills facility to see her husband, Lamar Odom, her message was bittersweet.

"I know these hospital halls way too well," she wrote. "[Hopping] from one room to another."

Lamar has been recovering in Los Angeles since being found unresponsive at the Love Ranch brothel in Crystal, Nevada, in October. The former NBA star was later placed in a medically induced coma after suffering a heart attack and organ failure, and Kim rescheduled her baby shower after Lamar's initial hospitalization.

A source tells ET that Khloe, who showed up at Cedars-Sinai by herself, was the first to arrive at the hospital, arriving late at the morning and spending a little over three hours there.

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Ryan Seacrest -- who is essentially an extended Kardashian family member at this point -- also took to Twitter to congratulate the second time parents, writing, "Blessings on blessings.. congrats on ur baby boy @KimKardashian @KanyeWest!"

As for mom Kris Jenner, she simply retweeted Kim's initial announcement that stated, "He's here!"

Kim and Kanye, 38, are already proud parents to 2-year-old daughter, North West. They announced the birth of their son on the 35-year-old reality star's app. "Kim Kardashian West and Kanye West announce the arrival of their son this morning," the statement read. "Mother and son are doing well."

The newborn was originally due on Christmas, but due to Kim's previous health issues, many people -- including the mom to be! -- speculated that the bundle of joy would arrive early.

PHOTOS: Kim Kardashian's Baby No. 2 Pregnancy Style

Kim reportedly experinced intense contractions Friday night, but the birth -- which took place in a deluxe maternity suite that is now filled with gifts, flowers and blue balloons -- went smoothly, according to People. The magazine also reports that she had experienced "pretty intense anxiety the lsat couple of days and especially yesterday just before the baby came."

The baby boy's name has not been announced yet, but we have a few ideas on what Kimye could name baby No. 2:

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