You've got to earn your ogling bones somewhere. Might as well be peeking at a boobtastic Audrina Patridge jogging across a crosswalk at the airport to catch her plane to Bubble Town, or wherever she goes to take her deep thoughts about tanning and looking great in a swimsuit, as she does.
Just to be clear, it's not acceptable public behavior to watch a rushing woman's chest puppies bounce up and down like it's some kind of outdoor theater. However, it is acceptable to do the very same as long as you're pretending to be looking with concern at a building post or street sign or such right next to the woman in question. Oh, also, she should be hot. Enjoy.