Avril Lavigne rocked her grows-on-you new single 'Here's to Never Growing Up' on 'The Tonight Show With Jay Leno' on Friday (April 26). The Canadian angst queen was a little restrained in her performance, remaining largely immobile and perched behind her microphone stand. But the fact that she remained stationary didn't lessen the impact of her vocal delivery.

The singer's hair was disheveled, her inky black makeup thick and smeared and her pretty party dress paired with knee-high boots There was also some writing on her left arm. It looked like a script tattoo. She was a mix of edgy, sexy and dangerous.

Cheers to never growing up!