"YOU'RE TITS ARE TOO DISTRACTING

!!!!!!!"
Yell it as loud as you can. Then claw her immediately
(look it up. origin: RSD). Or hug her. This will break her frame and social mask and will also break your own frame of nervousness. I am laughing as I am typing this right now, but I am confident that it'll work as long as you create a confident, unapologetic, and dominant frame after you yell that.
Reasons she won't hate you if you do this:
1. You're showing you have balls.
2. You are drawing the attention of the room to her. Women love attention. That's why she's wearing that risque top in the first place.
3. You're spiking her emotions and starting a great emotional roller coaster.
4. You're being one fun motherfucker lol.
She may show some fake contempt to this, but stifle it with your claw or hug and you'll be money. Laugh with a "don't worry, it's OK" attitude as you are doing this.
After that, stare at her tits all you want
I'd recommend implementing Ciaran's Shock and Awe tactic soon afterward.
Remember: you are a man and you don't apologize for it.
If you don't want to take that route... initiate some good solid eye contact, but don't worry if your eyes wander down to the tigalobitties. Just wander your eyes right back up to her eyes at the same speed. This conveys the unapologetic message, "Yes, I am checking you out. I know you're hot, you know you're hot, and I'm a man. So what?" If she calls you out, just verbalize that word for word lol.