Kendall Jenner has finally turned 18! The "Keeping Up With the Kardashians" star celebrated her milestone birthday with the Kardashians and posted photos on her Instagram. 

According to US Weekly, Kylie Jenner's  sister had a small, fun dinner party with her loved ones just five days after she took over Six Flags Magic Mountain in California.

[For the birthday photos, click HERE.]

Jenner was joined by her her younger sister, Khloe and Kim Kardashian, and mom Kris Jenner Several family members shared pictures from the happy occasion on Instagram on Sunday.

A very colorful snapshot shows the birthday girl, in a red-and-gold glittery mask, posing with friend Spencer Johnson, who had on a leopard print cat mask with black trim and colored jewels.

Lamar Odom's wife had on a bejeweled cat mask at the festive soiree. Khloe, who paired her mask with a black-and-white plaid jacket, black tank top and matching pants, posed with Jenner for another photo.

There was also a photo of the newly 18-year-old model blowing out the candles on her beautiful birthday cake, which was topped with roses.

Kanye West's fiance declined to share any snapshots from the celebration, but the Kardashian's matriarch caught North West's mom on camera and shared the photographic proof on Instagram. 

"Guess whoooooooo????" posted Kris Jenner, alongside a photo of the blonde starlet. The image showed Kim Kardshian's brown eyes behind a gold-trimmed black mask with purple, red, black, and gold feathers fanning across the top.

But though Kim Kardashian was being camera shy, she posted a special message to the now-legal model.

"Happy 18th Birthday to the sweetest girl I know," tweeted Kim Kardashian on Sunday. "I hope your adult years are filled with happiness & so much [love]."

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