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"Девушка, у вас есть молодой человек?"
"Девушка, у вас есть парень?"

These phrases are not exactly equal, but I have no time to explain the nuances now. You may use the first...

Ok, u're fine but i imply an approach to a "not married" girls, or at least not looking like one :D[/quote]

What about ты холостая?[/quote]
The word "холостой" can be used only with reference to...