Stewart, who works with Pure Leaf, tells PEOPLE about the “many fabulous movie stars” she has hosted on her shows

Martha Stewart still gets butterflies in her stomach when she sees certain stars.

The lifestyle expert, who collaborates on Pure Leaf’s latest campaign, tells PEOPLE that there are very few areas in her life that make her nervous in the spotlight.

“I’m not afraid of anything. I like being around people. I like being on TV. I like being interviewed. I like all of that,” says Stewart, who is currently publishing her 100th cookbook. Martha: The Cookbookon November 12th.

But when asked to recall moments that made her a star, Stewart was quick to respond that she had had “so many fabulous movie stars” as guests on her television shows over the years.

“When Russell Crowe came, he was still fit and great, but he perhaps had Gladiator. He was pretty attractive. Matthew McConaughey is still pretty attractive. Tom Cruise was so sweet and attractive in his first films,” she says. “There are all these memories of particularly attractive actors.”

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The celebrity encounters that come with her fame are especially exciting for her grandson, 12-year-old Truman Stewart.

Stewart attended the US Open with her grandson on September 8. The duo mingled with other famous spectators at the sporting event and Stewart posted photos from the day on Instagram. Commentators were quick to joke that she was the “Martharazzi.”

“They said I was better than TMZ,” she tells PEOPLE, noting that was not her intention. “I couldn’t believe it.”

“I made them for myself and Truman. He likes to send them all to his friends,” Stewart says of the pictures of Jon Hamm, Taylor Swift and Travis Kelce.

At the US Open, Martha and Truman posted photos together and Stewart said the teenager surprised her with his natural ability in front of the camera.

“He’s never been on a red carpet before and he always makes fun of it. And I said, ‘Oh, come on, walk the red carpet,’ and he immediately came running,” she says. “I couldn’t believe he was standing there with me. And he hugged me. It was crazy! He never hugs me.”

In her new commercial with Pure Leaf, Martha has another sidekick by her side: unsweetened iced tea. The commercial shows her retrieving bottles of the drink, which she calls “Martha’s Little Helper,” from various hiding places around her Bedford, New York, estate — like in a bouquet of flowers or in a clipping in a book.

Stewart said that while she doesn’t hide the bottles in her house, she keeps the tea nearby.

“It’s a very tasty drink. I keep bottles of it in the little cooler in my car and in my refrigerator for people who visit or work here. They all love it,” she says.

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