Showing Your Thong Is Trendy Again - At Least, According to These Celebrities

Someone needs to alert our old friend Sisqo, because his 1999 hit, "Thong Song," might be relevant once again. As it turns out, the divisive '90s trend of showing off your underwear - specifically, your thong - is back. In need of some proof? Allow us to present you with the irrefutable evidence, straight from Kylie Jenner's Instagram.

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