Miss Teen Delaware Melissa King has officially given up her crown Tuesday ... after a porn video surfaced on the Internet that allegedly features the 18-year-old beauty queen. A rep for the Miss Teen USA pageant just released a statement, claiming, "I would like to confirm the Miss Delaware Teen USA pageant has received a resignation letter from Miss King's attorney." King reportedly denies it's her in the hardcore sex footage -- but the girl in the video looks and sounds EXACTLY like King. In the vid -- shot some time in June 2012 -- the girl addresses the camera, claiming she turned 18 a couple months beforehand in March, which is King's birth month. The girl also describes her favorite sex position ... before the actual sex begins. A rep for the pageant tells us, they have already reached out to the first runner-up Angela Viscount in order to replace King.

Source - TMZ

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