The "all-new" Paris Hilton looks a lot like last year's model - with some minor fine-tuning.

Since her late June post-jail interview on Larry King Live, in which the heiress professed in confident tones that she had changed, her voice has almost entirely reverted back to the baby whisper that viewers came to know during her five seasons on "The Simple Life." And by early afternoon, she's glammed up for a night out on the town.

Some things have changed, though. Besides clubs and clothes, her post-prison "hot list" now includes selfless areas of interest.

Shortly after her prison release, she visited the Los Angeles Children's Hospital and is in talks to be their ambassador. "I went and visited the little premature babies who were only, like, 1 pound. And the cancer patients," she says. "It's nice when I can go there and visit them and brighten their day and make them smile. It feels good to be able to do that. I think it's definitely important for people to give back."

'Global Warming Is Not Hot'

Admiring the charity work of Angelina Jolie, Hilton applies her "hot" label to issues such as breast cancer and multiple sclerosis "because I lost my grandmothers to both of those diseases. And also helping the environment … global warming is not hot."

Once a slave to pink, this "new" Hilton is trying her very best to go green. "I'm ordering a hybrid car," she proudly announces. "I'm trying to get a Hummer one designed. I like hybrids, but a lot of them aren't that cute. I'm thinking silver … or maybe I'll get a green one!"

One part of Parisdom, it seems, will never change: the paparazzi presence. This afternoon, there are two sitting across the street from her Malibu beach house, waiting for her to take off somewhere in her baby-blue Bentley.

She rarely disappoints. The previous evening, Hilton attended the Rush Hour 3 premiere ("My favorite in the series so far," she says), then did some clubbing before heading home to the beach house, which she is renting through September.

"I came out to the beach to relax and get away because (the paparazzi) infested my Hollywood Hills home, and now they're all over the beach," she says, lounging on a white leather sofa on her brick patio. When she pulls a white curtain shielding her back patio from the sand, it takes only a few seconds for a dozen paparazzi to jump to their feet and begin snapping. "I feel bad for all the people who paid all this money to stay in Malibu," she pouts. "I can't even see the beach because I have to block (the view) off."