VIDEO: Miley Cyrus twerks, stuns VMAs crowd

The 20-year-old pop star stepped out onto the stage a ball of energy, wearing a fuzzy gray leotard, as her hit single, "We Can't Stop," played. An animated and uninhibited performer, Cyrus' dance moves were a clear departure from her "Hannah Montana" days.

When she reached the end of her song, the singer stripped down to a flesh-toned latex bra and matching underwear and began to perform "Blurred Lines" alongside Robin Thicke.

With Cyrus acting as Thicke's back-up singer and personal dancer, featured guest stars 2 Chainz and Kendrick Lamar went largely unnoticed.

"Miley better get a ... pregnancy test after all of that grinding," joked comedian Kevin Hart during the show.
Those watching on Twitter weren't quite sure how to respond. By far the most common reaction, as demonstrated by a photo of Will Smith's family seated in the VMAs audience, was shock:

See their facial expression below:

See the facial expression of other celebs too while she was on stage below:

Really funny. Watch video below: