How to approach to a hot guy?

I was at my friend`s party .. and there was one very hot good-looking guy ... and then as he was standing next to the bar we had a few eye contacts and then I had a very confusing thought : Should I approach? Or should I wait for him to make the first move?

But then I thought : If I had the courage to approach how should I do that?
How to approach to a hot guy?
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