I hear the old "club 'em" method still works, and if you come up from behind she won't know it was a date with you... or even that there was a date to start with.
Seriously, if you're interested enough to ask her, just ask her. She has a boyfriend, fine. That issue'll be dealt with when you get to it.
Why does it matter to you if the other 4 know? Are you planning on 'un-dating' them all in rapid succession and're afraid the 5th'll think you're shallow?
And for the record, hotness is hardly a factor to focus on if there's a relationship at stake. Plenty of both sexes are hot as hell, only to be shallow and spiteful underneath. Unless it's an exceptionally quick thing that you're looking for, hotness is not the way to go.
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