Barton and actress Rachel Bilson were attending a concert for their friends when they were invited on stage. On their way to the stage, the girls tripped over wires and fell, and the music stopped.
According to FemaleFirst, Barton said, "Me and Rachel rushed up on stage and tripped over the amp chord. The sound was cut and there was this screeching noise."
Barton left the scene with a red face from embarassment.