Taylor Momsen doesn't know how to function when she's not working -- which is ironic, given that she frequently held up production while she was a cast member on Gossip Girl.

"I'm completely neurotic, totally anxious and high-strung all the time," Momsen admits in the February/March issue of FHM UK. "I sleep for about four hours a night, or day, really. I go to bed at 9 a.m., sleep for four hours, then get up and start the day again."

"To be honest, I don't know what to do when I'm not working," Momsen insists. "I lose my mind if I'm not constantly doing something."

Momsen and costar Jessica Szohr left Gossip Girl for good in May 2011. These days, the Pretty Reckless front-woman is known as much for her music career as she is for her gothic look.

"I love stripper shoes and I always try to find the tallest ones. I'm always surprised no one talks about my shoes. I'm, like, on stage in 15-inch heels but people talk more about my eye make-up, which has stayed the same forever," Momsen tells FHM UK. "I always think that's funny."

"I got into heels when I was little, though," she explains. "My mom's really short so she always wears really tall heels and I used to steal them and now it's just a part of my everyday life."