How do I find out if she has a...

Boyfriend without saying the obvious, like, "Do you have a boyfriend?"

There must be a smooth way or romantic even to know if she has one or not.

A romantic way of asking? Take her to a candle light dinner and give her rose, take both of her hands in yours, look deep into her eyes and say, "Do you have a boyfriend?"

wahaha

(typin extra random words cos above mssg was 'too short')

I think what he means is something along the lines of "So a girl as beautiful as you obviously has a boyfriend, right?" or something along the lines of such.

Tell me why you are beating around the bush in the first place?

Let me guess....High School or lower?

i'd do what moeburn suggested.

Do it subtly. Find something on her (necklace, earings, ring, shirt, ANYTHING). Say, "Nice necklace/whatever. Did your boyfriend buy it for you?"

There you go.