Nick Lachey's ex-wife, Jessica Simpson, can't stop gushing publicly about her baby joy. But the 38-year-old and his new mate, Vanessa Minnillo, may be too busy working overtime to make their own baby dreams come true to notice.

"They are desperate to start a family," a source says of the pair, who tied the knot on July 15. "Nick and Vanessa are getting frustrated at how long it's taking to conceive."

As Star reported, the former party girl, 31, already has been conspicuously skipping alcohol during n