Miley Cyrus' plunging neckline draws eyes at CNN Heroes event

miley-cyrus-cnn-gi.jpg Miley Cyrus looked ultra glam on the arm of boyfriend Liam Hemsworth at Sunday's (Dec. 11) CNN Heroes: An All-Star Tribute event at Los Angeles' Shrine Auditorium.

The 19-year-old sported some serious cleavage in an otherwise sweet Roberto Cavalli gown. Her hair was cute in a loose side-braid. She topped off the ensemble with Neil Lane jewels and Alaia heels.

Miley later changed into a much more conservative royal blue gown to take the stage and perform "The Climb."

"What a glorious night to be apart of," tweeted Cyrus from the event. "Thank you for having me on your stage @CNN Such an honor."

On Monday, after changing her Twitter profile photo to one from the event, she tweeted:

"How cute did Liam look last night?!?! ! I felt like one of those cartoons all night w/ big hearts flying out of my eyes!?"
Photo/Video credit: Getty Images