Out of the whole Kardashian clan, they're the sister duo that share an undeniable close bond.And Khloe Kardashian made that loud and clear as she wished her elder sibling, Kourtney Kardashian, on her 41st birthday on Saturday.The 35-year-old took to social media to post a series of photos and videos of the birthday girl, including one embarrassing video of her on the toilet.Scroll down for video Birthday girl: Khloe Kardashian shared a video of her sister Kourtney on the toilet to ring in her 41st birthday on SaturdayThe throwback clip saw the pair attend an event together in which Kourtney had her black underpants and stockings pulled down while she sat on the seat.The birthday girl shared a shocked face when her sister came waltzing in to.
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