06/08/2009 05:12 am ET Updated May 25, 2011

Matthew Broderick Talks Twins: "I'm Nervous Even Thinking About It!" (VIDEO)

Matthew Broderick talks root canals and his impending twin girls on Letterman tonight.

CBS posted a clip of it online hours before it is set to air.

After discussing a root canal that involved having freeze-dried cadaver bone put in his mouth, talked turned to the coming babies.

"Oh man, I'm nervous just even thinking about it," Broderick said of the twins being girls.

He also talked about how 6-year-old son, James Wilkie is reacting, "He's pretty excited," Broderick claims. "He said, 'We have to get a lot of princess toys.'" WATCH: