Miley Cyrus Breaks Down During "Wrecking Ball" Performance In Vegas

It's been a tough week for Miley Cyrus ...

While everyone else in the world, including her fiance Liam Hemsworth, knew the pop star's relationship was over, Ms. Twerkalicious finally admitted to herself and to the world this week, that she and Liam are dunzo.

So what better way to get over breakup sorrow than to take to the stage in Vegas at the iHeartRadio Music Festial, that she was contractually obligated to attend anyway, and pour your heart out to a bunch of fans!

Miley did just that -- after twerking her way through "We Can't Stop," Ms. Hannah Montana closed her eyes and began her breakup ballad, "Wrecking Ball," as tears began to stream down her face.

Did her eyeliner run, you might wonder? NO! Miley and her peeps knew this was gonna happen so they shellacked that stuff on. Raw, unplanned emotion? Heck no - Larry Rudolph's got it alllll under control, y'all.