"In my own life, my whole world really revolves around family," the 30-year-old actress told ELLE in its November issue. "I do what I need to do, but it's like, 'How is everybody else doing?' And it's wonderful for me as an actress to put some of that into a character."
Katie said daughter Suri, 3, enjoyed seeing mom hard at work while she starred on Broadway in "All My Sons" in fall 2008.
"Suri would sit in my lap in the makeup chair. She'd hand the wig lady the bobby pins," she recalled.
Tom & Katie's daughter has been making headlines recently for her chic toddler wardrobe, and it appears the little apple didn't fall far from the tree.
"I love Alaïa, for sure. Stella McCartney. I like Ralph Lauren because I feel like it's very American, and I'm pretty all-American, from Ohio," Katie said when asked which designers she loves. "Isabel Marant and a new designer, Sari Gueron."
And husband Tom also appears to have the fashion bug – along with being known to offer up his thoughts on Katie's apparel.
"Tom has great taste," she said of the 47-year-old. "He usually likes everything [I wear], but sometimes I'll walk out and he'll say, 'I think that dress might be wearing you. You don't need that.'"
And when it comes to film fads, Katie admitted that she's not immune to Hollywood's current vampire craze.
"It can be any genre," she said when asked about what types of films suck her in. "I even like vampire movies – they just have to be well done. I want to believe in the characters. The minute it starts to feel not real, I'm not interested."
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PLAY IT NOW: Katie Holmes' Final Night On Broadway (Jan. 11, 2009)