Inside Kim Kardashian's Dinosaur-Themed B'day Bash for Saint

Kim Kardashian celebrated her son Saint's fourth birthday Saturday with a dinosaur-themed party that was one for the ages.

People magazine reports Saint's guests included his siblings — North, 6, Chicago, 22 months, and Psalm, 5 months — auntie Khloé Kardashian, his cousins, and other friends.

Kardashian showed off the party's elaborate dinosaur theme on Instagram, as well as sharing a pic of the M&M-encrusted chocolate cake. The M&Ms were meant to replicate dinosaur eggs.

The party also featured punch called "Raptor Juice," a "Jurassic jewelry"-making station, and a "Dino Dome" for kids to create imaginary dinosaur living spaces.

Loyal fans knew what was coming if they'd followed the prep on Kardashian's Instagram Stories. "Look guys! Saint's dinosaur party is today. How cute is everything? We are still setting up," Kim wrote prior to the kickoff.

On Thursday — Saint's actual birthday — Kim wrote on Instagram, "I have no words to describe how much I love your smile and those curls of yours Saint! You bring so much joy into my soul. You are so kind, loving and just so thoughtful and sweet! I am so happy today if your 4th birthday and We get to celebrate how much you've grown! Happy birthday my sweet sweet Sainty."