Kourtney Kardashian threw a 'Fast and the Furious'-themed birthday party for her sons on Saturday (17.12.16).

Kourtney Kardashian

Kourtney Kardashian

The 37-year-old beauty staged a "low-key" bash for Mason, who turned seven on December 14, and Reign, who was two on the same day, and her Los Angeles home following a week of celebrations for the pair.

Kourtney - who also has four-year-old daughter Penelope with Scott Disick - donned casual attire for the party, teaming her skinny jeans with sneakers, an oversized denim jacket and a red, white and blue bandana around her head.

Both the young and adult guests enjoyed the fun, with entertainment including a huge car-shaped bouncy castle, and a tricycle race track.

A giant balloon display in the garden spelled out 'The Fast and the Furious'.

Earlier in the week, the birthday boys enjoyed a family trip to Disneyland with their parents and grandmother Kris Jenner.

And Kourtney also penned a touching tribute to the pair.

Sharing a photo of Mason and Reign on Instagram, she wrote: "

"My twin boys born five years apart. Luckiest mommy in the world. Happy birthday to them. (sic)."

On her app, she added: "How crazy is it that I have two boys born on the same exact day? It is truly so special and meant to be. They changed my heart forever. Happy birthday to the coolest brothers I know!!!"

Meanwhile, Kourtney's 61-year-old mother, Kris, also paid tribute to her grandchildren on their special day, which saw her describe the pair as "two sweet boys".

Alongside a cute picture of the boys hugging one another, which she posted on her photo-sharing site, she wrote: "Happy birthday to these two sweet boys!! Our precious angels Mason and Reign. I love you more than words can say. #myheart (sic)."

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