Kylie Jenner Hangs With Tyga's Son as Rob Deletes All Pics of Blac Chyna Off His Instagram

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While Kylie Jenner was posting pics of her boyfriend Tyga, her brother Rob Kardashian was deleting photos of his pregnant fiancee, Blac Chyna.

The 18-year-old reality star joined the 26-year-old rapper and his son King Cairo, whose mother is Chyna, for a day at Six Flags Magic Mountain in Valencia, California. The doting dad shared a slew of videos to his Snapchat story of his 3-year-old son riding the rides, while Jenner posted pics of her boyfriend.

WATCH: Kylie Jenner Posts ‘Mr & Mrs’ Photo With Tyga

"My two loves" she captioned a photo of Tyga standing beside her red car.

WATCH: Amber Rose Shares Steamy Details on Rob Kardashian and Blac Chyna's Sex Life

The on-again, off-again couple appear to be going strong, but Kardashian has his fans concerned after he deleted all but one photo from his Instagram account. The post he left is just a photo of himself, and all the cute couple pics of him and Chyna have been removed.

ET has reached out to the Kardashian's rep. 

The 29-year-old reality star has yet to give an explanation as to why he wiped his Instagram account, and Chyna has been continuously posting on Snapchat, per usual. She even flashed her engagement ring while promoting one of her beauty products.

WATCH: Rob Kardashian Reveals Weight Loss in Rare Full Body Photo

In June, Chyna gushed over her fiance, telling ET, "Rob is just a big bundle of joy."

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