He hasn't attended any public events since June 2018, but Rob Kardashian was pictured leaving Drake's Halloween party on Thursday night, held at Delilah's.

Rob, 32, looked very cosy with his sister Kylie's BFF Stassie Karanikolaou and was pictured with his arm around her waist at around 5am.

Earlier on, the family had attended his sister Kendall's party at Blind Dragon and no doubt it was a joint celebration as it's her 24th birthday on Sunday.

There he is: Rob Kardashian made a rare public outing as he attended sister Kendall Jenner's Halloween party at Blind Dragon with his arm around Kylie's BFF Stassie Karanikolaou

Good marketing tool: Rob was sporting his own clothing line, wearing a HWD (Halfway Dead) sweater

Stassie didn't share any pictures of Rob on her Instagram account from the night in question.

Rob, who has a daughter, Dream, two, with ex Blac Chyna, is said to have quit drinking and has adopted a much healthier lifestyle of late, enjoying games of basketball.

He has not been completely out of the public eye and appeared on Kris Jenner's Instagram back in March, but it's fair to say he rarely ventures out.

Happy: Stassie had a big smile on her face as she was pictured alongside Rob

Could it be? It's unclear whether or not they are dating or just really good friends

Cheeky: Stassie gave Rob a sexy look over her shoulder as he placed his arm around her waist

Rob appeared on Keeping Up With The Kardashians back in May, albeit briefly and was pictured at sister Kim's birthday dinner last week, but only on Instagram.

His outing comes less than a week after Kylie and Stassie dressed up for another Halloween party as Britney and Madonna and re-enacting that famous kiss.

Audiences were stunned in 2003 when the Material Girl kissed Britney and then Christina Aguilera at the MTV Video Music Awards.

Sweet: Rob attended sister Kim's 39th birthday last week, but was only seen on Instagram

Rarely seen: Rob made a brief appearance on his mother Kris's Instagram account back in March, but it was a throwback

Kylie and Stassie have been nearly inseparable after a challenging start to the year when her best friend Jordyn Woods revealed she kissed Khloe Kardashian's love-rat boyfriend Tristan Thompson at a house party in Los Angeles on Valentine's Day weekend.

Meanwhile, as well as her own party, Kendall was also pictured heading to Drake's party that same evening, which was held at Delilah's.

Covering up in a coat, the 23-year-old gave just a glimpse of her feathered ensemble and her perspex shoes.

Friends forever: Kylie and new BFF Stassie were dressed to thrill as Madonna and Britney as they recreated their MTV Video Music Awards appearance in 2003

Like a Virgin: The 22-year-old billionaire got so into the costume that she leaned into her gal pal and reenacted the popstar's famous kiss

Earlier on in the evening, Kendall had shared pictures of her Halloween look on Instagram Stories.

When she first put on the dress, she posed in it, writing: 'still not finished' as she stood in front of the mirror.

Her dress was structured in design and was made up of feathers and she wore heavy eye make-up.

Metallic marvel: Rob and Kylie's sister Kendall wore a tiny gold elf dress to attend the same bash

Whatever the feather: She shared more detailed pictures of her look on Instagram stories

Cute: Kendall headed to Drake's bash wearing perspex heels

Beautiful: Kendall had pulled out all the stops to make sure she stood out from the crowd

She wore elf ears and an extravagant headdress, as well as large golden wings.

Kendall then went off to party with Gigi Hadid and Kaia Gerber, before heading out to party with Drake, who is a long-term family friend.

A host of other celebrities headed to Delilah's, including model Stella Maxwell, who channelled Britney Spears and Joan Smalls who wore black PVC.

Kendall is set to turn 24 on Sunday and no doubt the celebrations are set to continue.

Glam squad: A host of other celebrities headed to Delilah's, including model Stella Maxwell, (left) who channelled Britney Spears and Joan Smalls (right) who wore black PVC.

Meanwhile, Kendall allegedly out-earns her sister Kylie when it comes to paid Instagram sponsorships, a new Hopper HQ study published on Buzz Bingo claimed.

In the 'Celebrity' category of influencers, Kendall was reported to be at number one at $15.9 million annually with Kylie at number three with $3.8 million.

Their half-sister Khloe Kardashian is number four with $1.2 million, with Selena Gomez number two at $8 million and Priyanka Chopra number five at $1.1 million.

Tribute: Ladies at Kendall's earlier bash were all dressed up in versions of her orange Met Gala look