Co-writing songs and performing them night after night apparently doesn't guarantee you'll have the lyrics committed to memory -- not if your name is Miley Cyrus.

The 21-year-old singer is facing criticism after fans spotted her glancing at lyrics on a teleprompter positioned at the edge of the stage. Photos captured at a recent Las Vegas concert show a karaoke-style display on the screen.
Of course, artists forgetting their lyrics onstage is not uncommon, and the spontaneity of those moments can sometimes be a concert's most charming event. But during a tour that's generated one controversial move after the next -- from make-out sessions with Katy Perry to an oral-sex simulation with a Bill Clinton impersonator -- it seems some find this a step too far in terms of Cyrus tour behavior.

"I was at Miley's Vegas concert and took these pictures because I couldn't believe she needed a teleprompter with lyrics to all of her songs throughout the entire concert," an eyewitness told RadarOnline. "And it's not like they were just there for nothing -- I caught her looking at them more than a few times!"