Miley Cyrus Acts Trashy

Apparently Miley Cyrus showed up to LA Fashion Week Wednesday to catch her 20-year-old boyfriend, Justin Gaston, walking in the Christian Audigier show – and eyebrows rose at the pair’s behavior.

According to an eyewitness, Gaston and Cyrus – who was there with her mother, Leticia, and her manager – “were all over each other backstage.” The heat extended to the runway where, every time Gaston walked, he would blow a kiss and wink at his teenage girlfriend, who in turn, “licked her lips seductively as he passed her.”

The source also overheard a conversation in which Cyrus told a friend that “she was probably staying at Justin’s tonight and that they were going to skip the after-party and have a party of their own.”

A rep for Cyrus said, “Miley had a great time at the show, but the whole sleeping-over thing never happened. Miley went home with her mom and manager. Leticia is very strict with her.”

Cyrus – who posed semi-nude for Vanity Fair and posted a photo on the Web of herself pulling her shirt down to reveal a bra – was surrounded at all times by five bodyguards who “banned anyone from getting near her and formed a barrier so she wouldn’t be touched or bothered by anyone. With all the chaos she generated, other celebrities such as Heidi Klum and Billy Zane went virtually unnoticed and were completely ignored by the press,” our source said.

But those who broke through, including West Coast socialites Alan McCune and Darren Bettencourt, were treated very well. When Bettencourt told Cyrus his niece was a fan, the “Hannah Montana” star offered to call the girl, our spy said.

“It’s so funny,” said our source. “Everyone in LA knows that if you want Miley to show up at your event, all you have to do is hire her boyfriend as a model.”