Don't ask Paris Hilton if she's a has-been

Paris was told the shocking truth Wednesday during an interview with ABC News' Dan Harris. Stunned, heartbroken, enraged, she stormed off the set. Poor kid.

Paris presides over a $1 billion empire at the tender age of 30, yet her TV shows no longer are as compelling as they were during those halcyon Simple Life days.

It was all brought home when Harris noted that the Kardashian reality TV juggernaut has surpassed her in the culture. Paris walked out when he asked, "Do you ever worry about your moment having passed?"

Earlier, Paris gave a cogent account of why she comes off as a brainless twit on TV. "It's a character I developed for the Simple Life," she said. "They wanted someone who was an airhead, and kind of had the baby voice. . . . Sometimes when I'm on camera I'll revert back to it, just because I'm so used to it."

Paris Hilton has lived out many of her formative moments in front of a camera, but don't go thinking that means she'll tolerate just any kind of interview question.

The heiress walked out of an ABC interview when host Dan Harris asked Hilton "Do you ever worry about your moment having passed?"

Hilton snickered, consulted someone off-camera, and got up from her chair. She ultimately returned and continued the interview, but the moment is well worth watching.