During her festival appearance, Sophia Urista reveals her privates part and urinates on the face of a male fan live on stage (Video)

An American rock band’s lead vocalist wowed the crowd at the Welcome to Rockville festival with a stunning surprise performance.

Brass Against’s Sophia Urista urinated on a man’s face during the Welcome to Rockville festival at the Daytona International Speedway in Florida.

An audience member in the front row had just been invited to join her on stage for a “golden shower” during her performance of Wake Up by Rage Against The Machine.

As soon as he was welcomed onto the platform, he laid down and let the pee trickle down his body and head.

The man stood up and spewed part of the pee in the audience’s direction for more than 15 seconds before he walked away. If you want to see an example, go here.

On social media, the New York collective was compelled to apologise for causing uproar, claiming the vocalist had gotten carried away and that it would not be repeated.

“We had a great time last night at Welcome to Rockville,” Brass Against tweeted. “Sophia got carried away. That’s not something the rest of us expected, and it’s not something you’ll see again at our shows. Thanks for bringing it last night, Daytona.”

WATCH THE VIDEO HERE