So it's not surprising that everyone is asking Stewart, 72, for her opinion on Blake Lively's new lifestyle company Preserve -- and true to Stewart's reputation, she's as candid as ever.
"Let her try," she tells HuffPost Entertainment about Lively attempting to become "the next Martha Stewart" a.k.a. the "mother of all how-to's."
"I don't mean that facetiously!" she explains, laughing off the obvious dis. "I mean, it's stupid, she could be an actress! Why would you want to be me if you could be an actress? I just did a movie yesterday, though -- I can't even tell you about it -- but I want to be Blake Lively."
Stewart is actually friends with Lively and her husband Ryan Reynolds, and also dishes about what the attractive couple are like in real life.
"They're very friendly, very nice people," she reveals. "In a way, kind of shy -- not shy on the screen, at all, if you've seen any of Blake's movies -- but very shy in person. But she's a baker and a homemaker and now she's starting her own blog [Preserve] ... I haven't seen it yet."
Lively herself talked about her friendship with Stewart in her recent Vogue interview.
"I've only ever found her to be completely generous and kind," the Gossip Girl actress, 26, said. "She's one of those people who connect people with each other. She's there for you."
You might also like
Heidi Launches Her Intimates in Australia
Stars Hit Sundance
The 7 Worst Dressed SAG Awards Stars
Ryan Reynolds Jokes About His 'Disturbing' Experience With the New Baby
Watch: Jared Leto Can't Keep His Eyes Off Lupita Nyong'o POPSUGAR
Documentary Claims Nicole Kidman's Phones Were Tapped While She Was with Tom Cruise Fox News
Report: Female Exec Accuses Emile Hirsch of Assault Fox News
Love It or Leave It: Zach Galifianakis -- Gaunt or Svelte? Fishwrapper
Game of Thrones Star Nikolaj Coster-Waldau Tells Us How He Would End the Series POPSUGAR
Best Silly, Celebrity Tweets About Winter Storm Juno
Bill Cosby's Accusers: A Timeline of Alleged Sexual Assault Claims (Updated)
'Dance Moms' Star Abby Lee Miller Gets Feisty Before Court Appearance
Is Britney Spears the Oldest 33-Year-Old in Show Business?
The Inspiring Stories of the Miss Universe Pageant
Kylie Jenner's Cleavage in Jaw-Dropping Instagram Has Fans Freaking Out