Why Jessie J Will Be a Good Guest Judge on 'Dancing With the Stars'

— -- Jessie J will not only perform on ABC's "Dancing with the Stars" tonight, she'll also serve as a guest judge alongside the regular panel of Bruno Tonioli, Carrie Ann Inaba and Julianne Hough.

If you're wondering why Jessie J, a singer, is qualified to judge the way people dance, it turns out she's got plenty of experience. In fact, she was raised by dancers.

"My mom was a ballet dancer," the 26-year-old singer told ABC News Radio. "So the whole time when I was growing up, she taught me about lines, and just being elegant and [having] a pointed foot, not sickled [turned the wrong way]...[and] shoulders back."

Jessie J admits she's tried to follow her mom's advice when it comes to the whole "shoulders back thing," but it's tough.

"I try my best 'cause I'm tall so I do hunch when I'm onstage, 'cause the audience's always lower, so...I sing to them," she explains.

In addition to learning about dance from her mother, she also knows how to dance herself. The pop star grew up doing musical theater, and you can see her busting a move in her new video for "Burnin' Up."

As for her role on "Dancing with the Stars," Jessie J said she'll be keeping an eye out for talent.

"I'm just gonna look for people that feel, and are great," she said.