Miley Cyrus -- MTV VMAs 2011

Miley Cyrus shows off her bare back as she arrives at the 2011 MTV VMAs on Sunday (August 28) at Nokia Theatre L.A. Live in Los Angeles.

The 18-year-old actress wore a long-sleeved Roberto Cavalli gown with Lorraine Schwartz jewels and Azzedine Alaia heels.

Miley took the stage at the award show to present Best Rock Video with athlete Shawn White.

Over the weekend, Miley and boyfriend Liam Hemsworth were seen locking lips while out in Santa Barbara.

The 2011 MTV VMAs airs live TONIGHT at 9/8c!