Who is sydney dalton and what is this rumor going around that she slept with zayn Malik from 1D?

Ok so I was on instagram and I was looking at this picture and the caption was that there is this rumor going around that some girl Sydney dalton slept with the one direction member zayn Malik. So does anybody know if thats the exact rumor or not... If it isn't what is the rumor? And lastly who is Sydney dalton? (I'm not British I'm from The USA)
Thx for your help!

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