To stop her or not to stop her

There's this absolutely gorgeous woman that I've had the pleasure of walking past on a couple of occasions on my way to work [I'm aware of how lame that sounds].

I had the same pleasure today and got to thinking what I would lose if I just stopped her and said something, anything. The other thought that went through my mind was that 'If she's this gorgoeus, she must have all the guys at her office all over her, and if not, she must have all males wherever she goes after her. Then what chance do I stand'

So guys, should you stop a gorgeous woman walking down the street. Is this 'allowed'. And what, pray tell, do you tell her when you do.