"I've had the chance to do a lot of great things in my career and my life, but this is the one thing that more than any other I've looked forward to. The fact that it's actually here, and we're going through all these experiences, it's overwhelming."
While they don't know whether they are having a boy or a girl yet, Minnillo and Lachey -- who wed in a July 2011 ceremony that was later broadcast as a wedding special on TLC -- plan to learn the child's sex as soon as possible.
"We don't yet, but we definitely want to know. I can't take the knowledge that someone out there knows, but I don't know," Lachey told Ripa.
"It's like watching a sports game on TiVo -- I can't do it! If it's live, have to see it live."
In addition to their The Sing-Off and Wipeout credits, both have prior reality ties. Lachey starred in Newlyweds: Nick & Jessica with former wife Jessica Simpson, while Minnillo served as the host of ABC's True Beauty reality competition.
(Photo credit )
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