Are ya ready kids ... for Elon Musk 's estranged daughter's NSFW dance at a "Spongebob Squarepants"-themed drag show??? Vivian Wilson -- one of the tech billionaire's eldest kids -- hit the stage in Downtown Los Angeles Friday night ... painting her face bright blue and embodying the essence of Squilliam Fancyson, Squidward's frenemy in the hit animated show. In the drag show, it seems Squidward and Squilliam are lovers ... until Vivian's character turns down the other's proposal before lip-