The singer shared the news while guest co-hosting "Live! With Kelly" on Monday.
Vanessa Minnillo and Nick Lachey welcome second child!
Nick Lachey and Vanessa Minnillo Celebrate Their Engagement with a Trip to Mexico!
Baby number two for 98 Degrees' Nick Lachey and wife Vanessa Minnillo - Irish Mirror Online
Nick Lachey & Pregnant Wife Vanessa Hold Hands for Date Night at LA's New Hotspot!: Photo 3785328, Nick Lachey, Pregnant Celebrities, Vanessa Minnillo Photos
Vanessa Minnillo is very heavily pregnant on a lunch date with Nick Lachey
Vanessa Lachey Was 'Terrified' to Have a Daughter
Nick & Vanessa Lachey's Relationship Timeline Is Full Of Ups & Downs
Nick Lachey and wife Vanessa Minnillo expecting their second child - OK! Magazine
Former Miss Teen USA, Vanessa Minnillo Pregnant with Second Child
Jessica Simpson's ex husband Nick Lachey welcomes second child
Nick Lachey and Vanessa Minnillo announce they are expecting a baby - Mirror Online
Is Vanessa Lachey Pregnant? Who is Vanessa Lachey? -Latest News
Nick Lachey and Vanessa Minnillo's Relationship Timeline
Nick & Vanessa Lachey: Pics of the Couple – Hollywood Life
Nick & Vanessa Lachey Welcome Baby Girl