See Kim Kardashian's Extravagant Birthday Party for Son Psalm

Kim Kardashian is celebrating a major milestone for her youngest child, Psalm West, which means a blowout party—Kardashian style, of course.

Staying true to her family's reputation of throwing extravagant parties, the reality star and mother of four hosted an over-the-top birthday bash for her son Psalm as he rang in his 4th birthday.

The toddler, who officially turned four on May 9, was given an unforgettable birthday with a fire department-themed celebration at their Calabasas home on Sunday, which the Kardashians star showed off to her Instagram followers on Tuesday.

Kardashian, 42, went all-out for the affair, which transformed her property into a fire station building for the event, where party goers could even dress up in full fire-fighting gear for the festivities.

Other perfectly planned details included firefighters made completely out of colored balloons. a red ball pit, an antique firetruck, Dalmatian figurines, intricately painted murals and even a visit from real-life firefighters.

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"Happy 4th Birthday my beautiful smart curious baby boy Psalm," the SKIMS founder captioned her Instagram post on Tuesday. "I’m just so happy you chose me to be your mommy. You teach me so much every day."

Psalm is the youngest of Kardashian's four children with ex-husband Kanye West. The estranged pair also share daughters North, 9, and Chicago, 5, as well as their other son, Saint, 7.

The doting mom's caption continued, "I can’t wait to go through this life with you and that cutie smile of yours with your little fangs lol."

She also gave a shoutout to her friend Natalie Halcro for planning the "cutest party," as well as House of Elements for the "amazing event design and production."

Next: Kim Kardashian Comments on 'Insane' Divorce From Kanye West