Celebrities across the globe paid tribute to their brothers and sisters on social media on Tuesday in celebration of the holiday. The tributes -- both real life and fictional -- ranged from the very, very sweet (see Victoria Justice below), to the very, very awkward (we're looking at you, Cersei and Jaime Lannister) in a slew of posts to Twitter and Instagram.
Kim and Kourtney Kardashian went bikini-clad for their tribute, with the two sisters posting a gorgeous back-to-back snap in all-black swimwear on the beach. Plus, some orange-tinted sun visors!
On the sweeter side comes the aforementioned Victoria Justice, who posted a sweet Twitter video of herself and her half-sister, Madison Grace, singing Eiffel 65's classic "Blue (Da Ba Dee)."
"Happy #NationalSiblingsDay ?♂️ This video makes me so happy," Justice wrote. "Love you @themadisongrace, there’s no one else I’d rather bop around to Eiffel 65 with ?. P.S. Who else was obsessed with this song?! #nostalgia."
"First and foremost, always and forever, I am the middle Garner Girl," she wrote on Instagram. "How lucky am I to have such sisters. #nationalsiblingsday #middlesister #melissaandsusannah #ilovemysisters."
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Why Nyle DiMarco Doesn't Mind Being Single Right Now (Exclusive)
Heartthrob model, actor and producer Nyle DiMarco made quite a stir by posting a Twitter photo of himself and not just one but two brothers, Neal and Nico. Twitter lost it upon discovering that there were three of them.
A representative sampling of social media responses to DiMarco's post: "God made THREE gorgeous Demarco siblings???!!! *faints*" and "I see THREE full course meals."
It's #NationalSiblingDay❤️ to William Thomas-Terry Suzanne-Jan Leslie-Jeannie Diane-Kim Michelle & Patrick Steven who suffered through my endless magic tricks, puppet shows & impressions (Jerry Lewis-Richard Nixon-Bela Lugosi-Yogi Bear & many more)#Gr8fulpic.twitter.com/F3ROQIIfxb