Tom Cruise says he can't wait for his new baby to be born - so he can start changing nappies.The Hollywood heavyweight, whose fiancée Katie Holmes is pregnant with their first child together, admits he is really excited about the birth and is determined to be a hands-on dad. Cruise, who already has two adopted children from his marriage to second wife Nicole Kidman, said: "It's very exciting. Changing diapers, being there and having all that whole experience. I can't wait"Last week, Cruise splashed out on an ultrasound machine so he can watch his baby growing inside Holmes' womb.The heartthrob actor regularly scans Katie's bump to see their first child developing. The 43-year-old star told US talk show host Barbara Walters: "I bought a sonogram machine I am going to donate it to a hospital when we are done"However, Cruise said he can't tell the baby's sex yet, adding: "I don't know I just see a baby"

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