Speaking to Entertainment Tonight, Holmes, 26, says: "I have never been so happy in my whole life. It's truly so thrilling. He's the most amazing man I have ever met. ... Dreams come true, and I'm so in love with him."
She adds: "You know what? When you know, it's so exciting. It's like, 'Wow!'"
Echoing basically what Cruise, 41, told Oprah Winfrey, Holmes said that when it comes to the possibility of the two getting married: "We have to talk about that, but I love that rumor."
More on Tom & Katie
Holmes's interview with ET is in conjunction with her new movie, Batman Begins, which opens June 15 – two weeks before Cruise opens in War of the Worlds.