In an exclusive interview with ET, Holmes also opened up about her small part in the film, which stars Bullock, Blanchett, Kaling, Rihanna, Anne Hathaway and Helena Bonham Carter.
"I'm a fan of all the Ocean's movies," the 38-year-old actress gushed, revealing that she's playing herself. "I'm happy that it has so many amazing women in it, so many amazing actresses. It's really so much fun being a part of."
Ocean's Eight does not hit theaters until June 8.