Flirting

What’s the best way to approach a girl you don’t know in public?

I don't know any way where it won’t looking creepy because there have been times where I wanted to go up to a girl and talk to her but I don't know how to start it off. I thought about just being upfront and saying I thought she was cute and wanted to come talk to her
What’s the best way to approach a girl you don’t know in public?
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