It's official! Vanessa Minnillo, 30, is expecting her first child with hubby of eight months, Nick Lachey, 37, as the proud daddy-to-be announced when he guest-hosted Live! With Kelly on Monday morning with Kelly Ripa.

"We're having a baby!" The Sing-Off host announced on the morning talk show. "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."

Minnillo later expressed her own delight on Twitter. "Finally, Nick and I are ready to share our news. We have been blessed with a little Angel! We can't wait to meet Baby Lachey!!!" she wrote.

Minnillo, the new co-host of ABC's Wipeout is "just 12 weeks" along in her pregnancy, a source told Us Weekly. "They're both thrilled and so excited."

So excited, in fact, that they've already started thinking about names. "If it's a girl," Lachey said on Live!, "I think it might be Sophia. If it's a boy, I'm not sure." As for the gender of the baby, Lachey is eager to find out. "We don't [know] yet, but we definitely want to know. I can't take the knowledge that someone out there knows, but I don't know."

Sooner or later, the mystery will be solved. Minnillo is due late this summer, just a few months after Lachey's first wife, Jessica Simpson, is expecting her first baby with fiance Eric Johnson.

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