Taylor Momsen put on a raunchy show as she performed in Barcelona last night.

As half-dressed girls danced around her onstage, Momsen began grinding in the lap of a young female fan.

Last month, Momsen attended the U.K.’s Download festival in a cut-up T-shirt that exposed her breasts with her nipples covered in electrical tape.

And it’s not just her appearance that’s so shocking. In an interview last year with Revolver magazine, the teen talked frankly about sex.

Taylor said, “If it’s a good sex tape, I’ll watch it…I like some adult stars. I have a couple favorites. But I will say this: That Tommy Lee/Pamela Anderson video wasn’t very good. I wouldn’t f–k Tommy Lee.”

The singer is known for her outspoken nature and outrageous attitude, but this might have taken things too far, she is underage!

Watch the video below:

The Pretty Reckless are on tour in Europe until July 13th.