Hot mama! Kourtney Kardashian displayed toned legs in cut-off shorts as she and kids leave a cinema celebration for Rob's birthday

By Dailymail.com Reporter and Sameer Suri For Dailymail.com

Published: 02:13 GMT, 18 March 2017 | Updated: 11:22 GMT, 18 March 2017

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It is her brother Rob's big day.

And on Friday, Kourtney Kardashian, along with son Mason and daughter Penelope, left an LA cinema where they celebrated the youngest Kardashian's birthday.

In honour of his milestone 30th, the father of daughter Dream and enjoyed a St. Patrick's-Day-themed bash.

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All done! On Friday, Kourtney Kardashian, 37, along with son Mason and daughter Penelope, were spotted leaving an LA cinema

Keep up with Kourtney in her Good American shorts

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Good American The Cut-Offs

Good American is her sister Khloe Kardashian's label!

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When a family member has their own fashion label, it's only right that you show your sartorial support. So between Kanye West's Yeezy line and Kourtney Kardashian's new denim-centric brand Good American, the Kardashians are well and truly kitted out!

Kourtney championed her sister's label by stepping out in some Good American black denim cut-offs, which she teamed with ankle strap heels, a simple tank and a Louis Vuitton backpack.

Good American has been well recieved since its launch and not just by the Kardashian/Jenners. Miley Cyrus, Bella Hadid and Gigi Hadid have all got involved too.

With summer finally on the horizon, it's time to say goodbye to chunky coats and cosy layers and start thinking about warm weather staples instead. And a pair of denim cut-offs are arguably the ultimate go-to summer piece.

Click right to keep up with Kourt in her Good American shorts, or head to our edit below to get the look for less with our high-street hero buys from MOTO, Missguided, Boohoo and PrettyLittleThing.

* PRICES MAY NOT BE AS ADVERTISED

...NOW GET SHORTS LIKE KOURT'S FOR LESS

Kourtney displayed her toned legs in a pair of black denim cut-offs.

The mother-of-three tucked in a sleeveless black top into her set of shorts.

Her look was complete with a set of strappy heels, a jean jacket and a Louis Vuitton backpack.

Support! The family was there in honour of brother Rob, who celebrated his 30th birthday

What a cutie! Little Penelope, four, looked adorable with her pigtail buns

Gorgeous gams: Kourtney displayed her toned legs in a pair of black denim cut-offs

The right details: Her look was complete with a set of strappy heels, a jean jacket and a Louis Vuitton backpack

Bonding time: She looked happy to be joined by her kids

Wow factor: Kourtney is in incredible shape

When they first arrived at the theater, the threesome met up with Khloe's sister Kourtney, brother Rob and their mum Kris.

The family caught a screening of Beauty and the Beast at what looked to be private showing just for the group.

Rob was presented with a birthday cake that featured a picture of a his younger self dressed as Peter Pan.

Happy to celebrate! The threesome met up with Khloe's sister Kourtney

Mother love: Kris was also there to support her son

'Happy Birthday Rob!!! We love you!!!': Rob was presented with a birthday cake that featured a picture of a his younger self dressed as Peter Pan

Rob's other siblings Kim, Kendall and Kylie did not appear to have made it out for the festivities.

Also not pictured was the reality star's daughter Dream, who at four months, could be too young to attend a film.

But the Rob and Blac talent looked to have seen his daughter earlier in the day.

Not there: The reality star's other siblings Kim, Kendall and Kylie did not appear to have made it out for the festivities

'Bobby digital': Kourtney took to Instagram to share this cute throwback snap with sister Kim as a tribute to Rob

Rob posted an Instagram photo of his little infant in a shamrock-speckled dress with: 'Happy St. Patrick's Day' scrawled on it in green.

'The best gift of all‼️' he wrote in his emoji-strewn caption to the photo, which saw the baby lying down on what appeared to be a white bed.

Dream is Rob's child by former exotic dancer Blac Chyna, whom he'd begun dating January and whom he'd got engaged to that April. As of recent, the couple appeared to have split.