Tom Cruise has made an unusual purchase for his fiancee Katie Holmes — one that will let them see the development of their baby. "I bought a sonogram machine," Cruise says on ABC's "Barbara Walters Presents: The 10 Most Fascinating People of 2005," to air Nov. 29 (10 p.m. EST). Excerpts of the interview are published in the latest issue of People magazine, on newsstands Friday.

The 43-year-old actor said the couple will do their own sonograms, which show fetus development with ultrasound waves. Cruise said he will donate the machine to a hospital after the baby is born. Sonogram machines range in cost from $25,000 to $200,000.

Holmes' pregnancy was announced in early October. The couple, who have been dating since April, became engaged in June.

"We are gonna get married next summer or early fall," Cruise told Walters. "We don't have a date set yet."

Cruise said he didn't know if the baby is a boy or a girl. He has two children, Connor, 10, and Isabella, 12, from his marriage to Nicole Kidman. It will be the first child for 26-year-old Holmes.