WATCH: Why Did Paris Hilton Walk Out on a 'Good Morning America' Interview?

The World According to Paris star (briefly) storms off camera after being asked if she's a has-been

Today's lesson, courtesy of Good Morning America: If you want Paris Hilton to stop talking, just compare her to Kim Kardashian. During a GMA segment aired this morning, the 30-year-old heiress abruptly walked off-camera after being asked if her childhood friend Kim had stolen her thunder. Watch the clip below!

In the clip, reporter Dan Harris points out that Kardashian has successfully followed in Hilton's celebutante footsteps, then asks her bluntly, "Do you ever worry about your moment having passed?" A harsh question, sure, but Paris has weathered her share of criticism -- so it's a little surprising to see the World According to Paris star get flustered and run off to her publicist, exclaiming, "I don't want all this being used!" before realizing that her mic was still on.

Whatever got to her, it passed quickly; Hilton was back on camera in minutes, giving Harris her answer. "I've been in this business for 15 years now, so it's been a very long time," she said. "Just like any other business person or someone in the industry, it's always important to reinvent yourself and come up with new projects."

Even if Hilton hadn't thrown a mini-diva fit, the GMA interview would still be pretty revealing. For example: Paris admits that she often uses a fake baby voice when she's on TV.

"It's a character that I developed for The Simple Life; they wanted someone who's an airhead and kind of had a baby voice, so that's a character that I had to do and continued to do for five seasons," she explains. "So sometimes when I'm on camera I'll revert back to it a little bit, just because I'm so used to it, because I did it for so long."

The interview also reveals that Paris is independently rich, having raked in $1 billion from fragrances alone. Given that, plus her hotel inheritance, why does she bother with her 31 international fashion stores and 17 product lines?

"I like being able to do whatever I want, to buy whatever I want and not to have to ask permission from my parents, like I've seen some of my other friends do," Paris says. "They're adults, but they act like children."

But for us, the highlight of the interview is Paris showing off her doghouse: a miniature Spanish-tiled replica of her own home, complete with furniture and a chandelier, in which her 17 pets can play.

Off-camera, Paris also offered Harris a surprising revelation about her breakup with Cy Waits: She decided to end things after watching The World According to Paris. She claims that the show gave her an outside perspective on the relationship, and that she realized it wasn't working. (Wow -- how many messy breakups could have been avoided if all reality stars watched their shows that closely?)

The season finale of Hilton's reality show, The World According to Paris, airs tonight on Oxygen.

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