Heidi Pulls a Britney

"The Hills" are alive with the sound of -- something that kinda sorta resembles music.

Resident Hills biatch-turned-wannabe-pop star Heidi Montag britneyspearsed her way through her new single at club LAX in Vegas this weekend -- but her lips were synching almost as fast as her fan base.

When one makes Ashlee Simpson and Britney look like master vocalists, it's time to acknowledge that there's a problem.