Kourtney Kardashian Reveals All the Details of Sons Mason and Reign's Alien-Themed Birthday Party: 'It Really Was Out of This World!'

"I asked Mason if he wanted to have his birthday party with Reign this year and he said yes!" the mother of three wrote.

Photo: Instagram

Kourtney Kardashian threw the ultimate alien-themed birthday party for her sons Mason and Reign, and now the single mother of three is sharing all the details behind the bash.

It was a double dose of celebrations as the reality star celebrated her eldest and youngest child’s birthdays – both who share a Dec. 14 birth date – in the backyard of her Calabasas home. “Since Mason and Reign were born on the same day, I asked Mason if he wanted to have his birthday party with Reign this year and he said yes!” Kardashian, 36, recently wrote on her website and app.

With the help of celebrity party planner Mindy Weiss – the genius behind momager Kris Jenner’s 60th bash – Kourt came up with an out of this world theme, complete with a laser tag in a giant blow up UFO and DIY decorations.

“When it got dark outside, everyone put on their glow-in-the-dark sunglasses and alien beanies,” she continued. “We screened the movie Home outside on a big blow-up screen and set up comfy outdoor lounge chairs and lots of blankets for people to watch. It was truly out of this world!”

Fans can create their own alien decor with Kardashian’s easy (and creative) steps. “We made black alien eye stickers for the green lanterns that we hung in all of the trees. They lit up so the whole backyard glowed at night,” the rumored girlfriend of Justin Bieber explained.

Mason, 6, and Reign, 1, – whose father is Scott Disick – partied with sister Penelope, 3, and cousin North West, 2, along with "cool aunts" Kylie Jenner, Kendall Jenner and Khloé Kardashian.

And the food was just as fun. Restaurant chain Wood Ranch BBQ & Grill catered the event while hot chocolate, coffee and chai lattes made for yummy movie snacks all throughout the night.

Of course, there was cake! Not one, but two! Mason and Reign had their own alien-shaped cakes with lime green space creatures on the top for the big brother.

And the fun continued on to the next day as Kardashian treated her kids to a day at Disneyland with North, uncle Kanye West and grandma Kris.

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