<p>For her 21st birthday in early November, Kendall Jenner slipped into exactly the same (very revealing) dress that socialite Paris Hilton wore for her 21st birthday bash in London. Boasting a backless design, a plunging bodice and a very short hemline, it certainly was a risk to wear on a potentially drunken night out! <i>[Photo: Rex/Instagram]</i></p>