Rob Kardashian is dating Blac Chyna: Kylie Jenner's brother appears in romantic clinch with Tyga's ex fiance... but his pals worry she's 'preying' on him

Keeping up with the Kardashians just got even more complicated. 

In a surprise twist, the reclusive Robert Kardashian is romantically entwined with Blac Chyna, who was previously engaged to Tyga - Kylie Jenner's on again, off again boyfriend. Blac is the mother of Tyga's son King Cairo. 

On Monday, she posted a picture of herself with a tattooed man's arms around her. The distinctive ink matches up with Rob's sleeve.

She captioned it: 'The beginning.' 

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New romance? Tyga's ex Blac Chyna posted this picture on Monday that showed her in a romantic clinch with Robert Kardashian

Snap: The distinctive ink matches up with Rob's sleeve tattoo 

Blac, 27, can be seen smiling as she looks down in the black and white photo, which shows her entwined in an embrace with someone off camera.

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The shot focuses on the mystery man's arm, which has a sleeve of tattoos including a rose, a heart with thorns wrapped around it, and an angel.

A snap from Rob's Instagram reveals the former Keeping Up with the Kardashian star's sleeve matches up with the one in the picture.

Back in September the reclusive star, 28, had sparked dating rumors with Chris Brown's ex Karrueche Tran as he shared a snap of her on his Instagram account.

He wrote alongside the close-up photo of the model - which immediately sparked thousands of 'likes' from his Instagram followers: 'I like when she send me pictures.'

Previously he had famously dated The Real co-host Adrienne Bailon from 2007 to 2009, before a messy breakup which would later prompt Twitter feuds between the star and Rob's sisters.

Kardashian, who's shed 15 pounds as a result of his new workout regime and diet, is believed to be planning a comeback on his family's reality show, Keeping Up With The Kardashians. 

After the photo emerged, E! News confirmed that the pair were in fact dating, though noted things are complicated.

A source has told the publication that there is 'concern' about the pairing, with the insider feeling that Blac is 'preying' on Rob 'during a weak time.'

It is also a concern that Blac is only using Rob to get back at Kylie Jenner, since the two have been feuding since the E! star got together with her ex - and father of her son - Tyga.

The source explained how Blac and Rob got together, despite the latter becoming reclusive over the past year. 

See Kylie Jenner updates as her brother appears in romantic clinch with Tyga's ex fiance 

Sparking rumors: This past September Rob sparked rumors that he was dating Chris Brown's ex Karrueche Tran as he shared this snap on Instagram - he previously dated Adrienne Bailon from 2007 to 2009 

Making changes: Rob (pictured with mother Kris Jenner in 2013) has recently shed 15 pounds as a result of his new workout regime and diet and is believed to be planning a comeback on his family's reality show, Keeping Up With The Kardashians

'She and Rob have known each other for a while and she had been staying in touch,' the insider shared with E! News. 

In October Blac was rumored to be dating Ciara's ex Future, even showing off a tattoo she had gotten of his name on Instagram - though the rapper denied the relationship.

He took to Twitter, posting: 'Single & focusing on what makes me happy,' then - as if to further deny any connection to Chyna - followed it up with: 'U kno I dnt f**k wit no rumors...'

And prior to that the entrepreneur was linked to pro boxer J'Leon Love, with whom she reportedly split in September, as reported by TMZ.

Small world: Blac Chyna was previously engaged to Tyga - currently dating Rob's little sister Kylie Jenner (pictured in 2014) 

A part of the group: Before Kylie and Tyga got together, Blac Chyna was very close with Kim Kardashian, and even starred in the family's E! reality series (pictured filming with Kim, Kourtney, and Scott Disick in 2013)

Blac most famously dated Tyga - currently dating Rob's younger sister Kylie - from November 2011 to late 2014, and the two were engaged for less than two years. The exes share three-year-old son King Cairo Stevenson. 

Though they officially went public after Kylie's 18th birthday this past August, Kylie and Tyga certainly had not been shy about being in public together, fueling dating rumors since October 2014.

This has caused a lot of tension between Blac, Tyga - real name Micheal Ray Stevenson - and Kylie, extending even to her older sisters.

Kylie and Blac Chyna - real name Angela Renée White - had been involved in a feud for months, with the pair regularly lashing out at each other on social media.

The way they were: The model was best friends with Kylie's sister Kim before the 18-year-old began dating her ex Tyga (pictured in 2014 with ex Tyga, Kim and husband Kanye West)

Moving on: Not long after their split in 2014 Tyga was spotted out with Kylie, prompting dating rumors - they have since gone public following the star's 18th birthday in August (seen here at Olivier Rousteing's birthday in October)

The Lashed founder came under fire in April as she shared a series of texts that allegedly showed her ex Tyga was trying to reconcile their relationship.

Then Kylie reportedly jumped to Twitter to diss the star - and her claims - writing: 'I wish a certain someone would hop off already. It's really stupid to stoop down to a childish level over male attention, get over it please.'

However, the Lip Kit by Kylie founder made sure fans knew she was staying out of it, as she later clarified the issue to her followers. 

Kylie posted: 'I didn't know u could change the font size on tweets now #fake (sic),' as it was proved that her snarky post was actually a fake. 

Shade: Tyga's former love Blac took aim at the youngest sibling of Kim Kardashian by mocking Kylie's signature full pout with an Instagram photo of herself wearing huge fake wax lips 

Stirring the pot: Blac later caused tensions to rise as she shared screenshots of texts her ex had allegedly sent her, trying to reconcile their relationship 

Kylie's boyfriend Tyga, however, did jump on Twitter to hit back at his ex, posting: 'I ain't here for the tea,' followed by: 'Focus on what's real in life. And surround yourself with people that you really care about.its simple.'

Then in August the mother-of-one took to Instagram to share a series of snaps, showcasing her hot bod in a bright pink bikini.

She captioned the sultry image: 'I know u Miss me,' seemingly as a thinly veiled message to her ex, Tyga.

Around the same time her best friend Amber Rose had spoken with Perez Hilton to try to clear the air about another feud that had arisen surrounding Kylie and Tyga.

Not having it: However, Tyga took to Twitter to shoot down Blac's claims with a series of tweets, though he didn't directly reference the star

Drama: The tweets came as his girlfriend, Kylie, had to jump on Twitter herself to refute claims that she had posted a slight against Blac, which later turned out to have been a doctored tweet 

In February the model had criticized Tyga for dating the youngest daughter of Kris Jenner, calling her 'a baby.'

'She needs to go to bed at 7 o'clock and relax,' Amber said during an interview with New York's Power 105.1. 'Tyga should be ashamed of himself,' she added.

This prompted older sister Khloe to get involved in Kylie's defense, tweeting: 'Please don't worry about my sister who has a career and her sh*t together at ONLY 17... Please stop talking about us in interviews mama. None of us talk about you.'

And it continues: Then in August the mother-of-one took to Instagram to share a series of snaps, showcasing her hot bod in a bright pink bikini, seemingly hitting at her ex as she captioned one sultry image: 'I know u Miss me'

Unfazed: Tyga didn't seem bothered by the news of his ex moving on with Rob Kardashian, as he shared this snap aboard a private jet, showing off a wad of cash garnered from a trip to Las Vegas

Kim soon got dragged into the row, with obvious comparisons being made of the two - with the fact that Kim is now married to Amber's ex Kanye West cropping up on more than one occasion.

However, Amber insisted she wanted the drama to end, saying: 'It's like we're grown. Let's have a conversation. I want to just end it all like, you know, it's hard for me to be a feminist and still have those loose ends,' she said. 'I really don't want to argue with those girls. It's just – it's just not that serious for me.'

Meanwhile, Tyga took to Instagram on Monday to flaunt his winnings from a trip to Las Vegas - seeing as the picture read 'Thnx Vegas' - posing in a private jet while showing off a stack of cash.

KHLOE KARDASHIAN'S TWITTER WARNING: 'NEVER GO AGAINST THE FAMILY'

That same day Rob's sister Khloe Kardashian, 31, took to Twitter seemingly firing off a curious warning to Blac Chyna with a series of tweets. 

'You can do anything. But never go against the family,' the Kocktails with Khloe star wrote, following it up with a reference to The Godfather. 

However, she later clarified that she was referring to a family member who had promised to make an appearance on her new chat show, before bailing at the last minute, leaving her scrambling. 

Cryptic: As Khloe Kardashian referenced The Godfather and tweeted to 'never go against the family,' fans thought she may have been sending a curious warning to Blac Chyna, following her snap in which she appeared to be posing with her younger brother Rob

'You guys do know I have about 100 family members correct? I was referring to a family member who just bailed out of doing my talk show today,' she wrote, coyly adding: 'But hey, maybe my quote can go towards a few people today.'

She then joked about the reaction to her aggressive post, sharing: 'Well now I know what all my family members are doing lol. Thanks Twitter.' 

After clarifying her remarks the star continued to share her disappointment in her flaky guest: 'Man.... Scrambling to figure this out the morning of taping. I never leave people hanging.' 

The Strong Looks Better Naked star finally concluded: 'This is why I can't miss my workouts lol. I go crazy!!! Hahahaha.' 

The rapper could be seen holding a giant wad of bills with one hand as he sat with his eyes closed, sporting a black zip up and grey trousers, along with a gold chain necklace and coordinating wristwatch.

He didn't seem fazed by the news of his ex moving on to Rob, as he promoted his Snapchat account in the caption, writing: 'LamboLuxury.'

And Blac certainly seemed to be in good spirits as she later took to Instagram to share shots from a photo shoot.

Model behavior: Tyga's ex showed off her pert derriere in some fishnets and rolled back jeans, also flashing some skin in an off-the shoulder top with cut-outs in a series of shots from a photo shoot shared to her Instagram account on Monday

In good spirits: Later on Monday Blac looked giddy in a video she shared to Instagram of her getting her hair styled while at a photo shoot

She showed off, long, grey tresses, worn partly in a top knot, with the rest cascading down her back in dramatic curls.

She wore an off-the-shoulder black, patterned top with cut-outs, which flashed a bit of skin as she posed sitting on a white stool.

Blac put her pert derriere on display in fishnets as her distressed jeans were rolled down for the photos.

Grateful: In the short clip she gushed about loving her silver tresses - happily sharing: 'Thank you so much. The best of the best' - as Kellon Deryck (R) could be seen styling them

The star seemed absolutely giddy in a short video she posted following the photographs, in which she gushed about her hair.

'I love my hair so much right now,' she said, as Kellon Deryck styled it. 'Thank you so much. The best of the best.'