Khloe and Kourtney celebrate Rob's 30th birthday with a St. Patrick's-Day- themed bash and present him with a cake of himself as Peter Pan

By Brittany Valadez For Dailymail.com and Sameer Suri For Dailymail.com

Published: 01:15 GMT, 18 March 2017 | Updated: 11:30 GMT, 18 March 2017

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They are his biggest fans.

And Khloe and Kourtney Kardashian celebrated brother Rob's 30th birthday with a St. Patrick's-Day-themed bash at a cinema in LA.

Mum Kris also stopped by to join in on the fun in honour of her only son.

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Sisterly support: Khloe, 32, and Kourtney Kardashian, 37, celebrated brother Rob's 30th birthday with a St. Patrick's-Day-themed bash at a cinema in LA

'St. Patrick's Day,' said Khloe, 32, as she filmed herself for Snapchat.

The gorgeous blonde showed off a full glam look, clad in a leather jacket. Atop her head was an oversize hat featuring the theme of the Irish holiday.

Sister Kourtney, 37, was decked out in holiday gear, including a pair of glasses and a smaller hat.

Festive: The gorgeous blonde showed off a full glam look, clad in a leather jacket. Atop her head was an oversize hat featuring the theme of the Irish holiday

Appropriate ensemble: Sister Kourtney, 37, was decked out in holiday gear, including a pair of glasses and a smaller hat

Mum's support: Kris Jenner,61, joined the in mix

The family caught a showing of Beauty and the Beast, in what looked to be a rented out screening.

Kris joined the in mix, along with Kourtney's children.

The family presented the 30th with a birthday cake that featured a picture of a young Rob as Peter Pan.

Taking it back! The family presented the 30th with a birthday cake that featured a picture of a young Rob as Peter Pan

'Happy Birthday Rob!!! We love you!!!': The family shared a sweet message on the cake

While having his family there was surely a treat, perhaps his greatest gift was daughter Dream.

Earlier in the day, 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.

Fun with aunt Koko! Khloe and Mason Disick, seven, posed for silly photos

The son of 'momager' Kris Jenner and the late O.J. Simpson lawyer Robert Kardashian had also posted a photo of a balloon display set up in his honor.

Much of his front hallway was taken up by silver inflated letters spelling: 'HAPPY BIRTHDAY ROB,' flanked by masses of balloons in shades of green and gold.

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.

Doting dad: Rob Kardashian posted an Instagram photo on St. Patrick's Day - which was also his 30th birthday - of his baby daughter Dream, whom he called 'The best gift of all'

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

They dramatically split in December, Rob posting a Snapchat video bewailing her absence while wandering through their empty house, but reunited soon after.

There are conflicting rumors about whether they've split again since, and though neither of them's confirmed as much, a source has dished to People about conflict over Dream in an article that ran this week.

'Rob wants dual custody of their child and Blac Chyna is giving pushback,' said the source, adding: 'They are still figuring things out but she will certainly do whatever it takes to have Dream be with her for the majority of the time.'

'Happy Birthday to me': The son of 'momager' Kris Jenner and the late O.J. Simpson lawyer Robert Kardashian had also posted a photo of a balloon display set up in his honor