Many were unaware that Kim Kardashian and Kanye West's baby North was in attendance at her cousin's birthday party.

Kourtney Kardahsian's little girl, Penelope Disick had her first birthday on July 8th and can we just say her party was ridiculously extravagant!!! For a one year old who won't even remember that day it looked like a pretty awesome bash.

The celebration which took place on Sunday, July 14th at Kris Jenner's Calabasas home hosted 150 guests. Aside from the guest of honor her other grand daughter North West made an appearance at the soiree but stayed inside and out of sight.

A source told Us Weekly, that Kim Kardashian's baby girl "stayed in the house because she's too little to be around that many people. She's doing great though!"

In one of the pictures posted from the party, Kourtney is wearing a short floral dress paired with oversized sunglasses as she posed between huge pink and white balloons in the yard.

[For photos from Kourtney Kardashian's daughter's first birthday party click HERE. Check out photos of the family shopping for Penelope Disick's bash check out Kourtney's Instagram Account]

To be more accurate, the party was decked out in large pink balloons. According to the magazine, Geronimo balloons were responsible for designing the 3ft wonders.

A source said that Geronimo Balloons designed "3 ft. balloons with handmade paper frill to match the party colors -- light pinks, nude pink, rose and creams.

"Each balloon takes the equivalent helium of 30 regular size balloons. Prices for similar designs to the Kardashians' is $150 each."

The insider told the magazine that Kourtney selected the colors and had three balloons "greeting party guests at the entrance and in the garden."

The proud mama tweeted, "Happy 1st birthday to my sweet precious angel. I can not believe it has been a year. Truly blessed."

What do you think about Kourtney Kardashan's lavish birthday party for Penelope Disick? Are you ready to see North West already? Leave us a comment of your thoughts below.