LOS ANGELES (AP) — Forget about her famous aunt or her actor-father, when Emma Roberts needs advice on how to look like a TV star, she asks her six-year-old sister.

"I'm embarrassed to say I do ask her sometimes when I'm putting on clothes. I'll say, 'Is this cute, Grace?'," the 16-year-old star of TV's "Unfabulous" said during a recent phone interview.

When it comes time to tune in the show, the niece of Julia Roberts and daughter of Eric Roberts also knows she has perhaps the sharpest-eyed, and sharpest-tongued, critic in her younger sibling.

"She'll be like, 'I don't think I was really a fan of that shirt you were wearing'. I'll say, 'Thank you for that, Grace'," Roberts says, giggling. "If I want an honest opinion I'll definitely ask her."

In films, Roberts has portrayed everything from an iconic teen sleuth in "Nancy Drew" to a mermaid's best friend in "Aquamarine". But she says her "Unfabulous" character, the cute but klutzy Addie Singer, may be closest to the real her.

In a TV movie version of the show that airs Sunday on the Nickelodeon cable channel, Addie finally gets to shed her less-than-hip persona when she manages to book an ocean cruise for her school's end-of-the-year field trip.

Unfortunately, the boat heads straight into a storm. Roberts has been home-schooled since eighth grade, but is planning to return to "real school" for her senior year.

Then it could be on to college between making movies. "I want to study photography and maybe journalism because I've gotten into writing lately," she says.

As for her sister: "She really wants to be a singer.

"But she changes her mind a lot. Like the other day she said she wants to be a cowgirl now."