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Reality television star Rob Kardashian showed the world just how far back his relationship with vixen girlfriend Blac Chyna goes this week on social media.

A couple screenshots of comments Rob K left on a throwback Instagram pic of Chyna surfaced online Monday (March 21) and hints at them previously being friends.

Aww who knew #RobKardashian and #BlacChyna went way back like that #BaeWatch

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Check out Rob Kardashian and Blac Chyna partying in Jamaica on the next page…

Earlier this month, Rob and Chyna hooked up at a Jamaica nightclub.

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#PressPlay : #BlacChyna getting ' it in Jamaica! #WinePonIt @bojtv

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Rob Kardashian and Kern Spencer

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Details of their overseas venture also sprouted online a couple weeks ago.

Running away from the drama! Rob Kardashian and Blac Chyna flew first class from Los Angeles International Airport to Montego Bay, Jamaica, on Saturday, March 12, just days before his 29th birthday. Kardashian, 28, looked a lot slimmer in black sweats and sandals as the couple headed off on their romantic getaway. “They both looked happy, but showed no signs of affection,” an eyewitness told Us. (Us Magazine)

Rob shut down split rumors on his Instagram page in early March.

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