Rob Kardashian returns to social media to celebrate sister Khloé's birthday

Rob Kardashian, 36, returned to social media for the first time in four months on June 27 to celebrate his sister Khloé Kardashian's 39th birthday.

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Rob Kardashian joins Khloe's birthday trip as he's spotted in background of video piling into Kylie's $78M jet

Rob Kardashian returns to social media to celebrate sister Khloé's birthday

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Rob Kardashian returns to social media to celebrate sister Khloé's birthday

Rob Kardashian returns to social media on Khloe's birthday

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Rob Kardashian makes rare appearance in photo on Khloe's birthday and gushes about how 'thankful' he is for big sister

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