'A rare sighting!'

While most of the Kardashian family are pretty much the biggest names out there when it comes to the world of Instagram, there’s one member of the clan who is less active online.

Kardashian

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Rob Kardashian, the son of Kris Jenner and brother to the Kardashian sisters Kim, Khloe and Kourtney, prefers life out of the social media spotlight.

He does have an Instagram account but it is run by mom-ager Kris and he rarely appears on the fam’s reality show Keeping Up With The Kardashians anymore.

But thanks to his half sister Kylie Jenner, Rob made an appearance on the ‘Gram for the sweet sibling snap.

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5am birthday adventures with my two fav people🥳

A post shared by Kylie ✨ (@kyliejenner) on

As the entire family got together for a Halloween party to celebrate Kendall Jenner’s 24th birthday, Rob cosied up to the youngest of the Kardashian-Jenner brood.

Captioning the photo, make-up mogul Kylie penned, ‘5am birthday adventures with my two fav people.’

Responding to the upload, supermodel Kendall hinted that Rob’s appearance was a special moment for her birthday, commenting, ‘best bday present ever ❤️.’

Then the three’s sister Khloe shared some more family love, adding, ‘My favorite photo!!! 😍😍😍.’

Meanwhile, heaps of Rob’s excited fans pointed out how well the star looks in the image.

Look how slim rob looks!!!’ one penned.

Rob looks so good 😍,’ added a second, while a third joked, ‘A rare rob sighting!

Another sweet comment read, ‘Rob!!!!!! I love Rob!!! Always have!!! ❤️❤️❤️❤️.’

Adding to the Rob filled content, his mum Kris shared a sweet mother-son snapshot of the pair in some rather epic Halloween costumes.

Rocking the same Troll outfit as his two-year-old daughter Dream, Rob grinned in a bright pink wig and matching moustache.

Halloween 2019 @robkardashianofficial ❤️🎃 Rob and Dream dressed as Papa Troll and Poppy Troll 💕 #family #love#Halloween #memories,’ she captioned the post.