Jessie J Demonstrates The Dangers Of Nail Art On 'When I Was 17'

British songstress talks about her early toy-store job on this week's episode, airing Saturday at 11 a.m. ET.

British singer/songwriter Jessie J kept herself plenty busy in her teenage years. On this week's "When I Was 17," the newcomer shares that as an ambitious teen, she signed up for singing lessons, and to pay for that, she worked at a major toy store in London called Hamleys.

Working around fun toys and cute kids must have been a breeze, no? Not quite, according to Jessie!

"I did 'nail jazz,' and so I was basically drawing snowmen, Christmas trees and smiley faces," she explained. "And I used to lose my voice all the time 'cause I'd be like, 'Hello! Would you like a nail jazz demonstration?' "

Jessie's voice wasn't the only thing affected by the job. Because she had to paint so many nails each day, she actually injured her hand in the process!

"It was hard work. I actually gave myself an injury. I had a specific muscle that I basically ripped, because I did so many nails every day," Jessie says.

Who knew working in a toy store could be detrimental to your health? Still, Jessie looks at the bright side of things.

"The positive of the job was that now I can draw a snowman or a Christmas tree on anyone's nails!"

With her star firmly on the rise and with her debut album dropping in the U.S. on April 12, Jessie's probably not going to be doing more nails anytime soon!

"When I Was 17" — this week featuring Jessie J, Tyrese and Lupe Fiasco — airs Saturday (April 2) at 11 a.m. on MTV.