Credit: Denise Truscello/WireImage/Getty Images.

Hannah Montana is but a memory. Miley Cyrus looked light years away from her former Disney alter-ego at Sunday's Billboard Music Awards, wearing a white Jean Paul Gaultier mini suit with a neckline that hovered around her bellybutton. Smokey eye makeup and stilettos added to the very grown up look.

A style change makes sense for the 19-year-old pop star. She waded into the acting world with "LOL," a romantic comedy that hit theaters on May 4, and rumors about her imminent engagement to "Hunger Games" actor Liam Hemsworth have been floating around for months. But lest you think she's growing up too fast, take a gander at her Twitter feed, where she's still posting age appropriate things like "what the eff! People are so lame!"