Los Angeles ? Jamie Lynn Spears is looking for the show business equivalent of lightning striking twice, if not exactly in the same place.

“I’ll probably do a lot of acting first, then go to singing,” says the precocious kid sister of pop star Britney Spears. “But I am going to definitely sing someday,” she adds after a brief moment of reflection about the matter. “So when I do start singing, buy my album!”

For now, the youngest of three Spears siblings (the oldest is a brother, Bryan), says she has her hands full balancing school and her responsibilities as the youngest cast member of the comedy-variety show “All That” (Saturdays, 7 p.m.).

A sort of “Saturday Night Live” for kids, “All That” is in its eighth season on Nickelodeon; Jamie Lynn joins a veteran cast of actors who are an average of 4 years older than her.

It was a slightly awkward adjustment for the stick-thin 11-year-old from Kentwood, La., who looks like a younger, skinnier version of her 20-year-old superstar sister.

But having wrapped a season of new episodes that began airing in September, all concerned say Jamie Lynn fit right into what she acknowledged was her first substantial acting job. Earlier this year, she made a brief appearance as a younger version of her sister in “Crossroads,” Spears’ film debut, and she’s done a handful of commercials.

“At first I was too scared to act in front of these people, so I was real shy,” says Jamie Lynn. “But then,” she adds, “they were actually really nice. I thought they were going to be these serious people. But they were a lot of fun.”

It didn’t hurt, the others say, that Jamie Lynn was willing to jump right into scenes that included dousing her with egg yolk and tossing her into trash bins.