Welcome to the world, Maxwell Drew Johnson, the much-anticipated first child of singer-turned reality star-turned fashion mogul Jessica Simpson and her pro football-playing fiancé Eric Johnson. Celebrity watchers have been waiting with bated breath for the birth since her mother appeared nude and (very) pregnant on the April cover of Elle magazine. Here at Forbes, we’ve been panting for a very different reason: as obsessive talliers of celebrity incomes we anticipate a significant jump in Ms. Simpson’s earnings as a result of her entering the Mommy club.Yes young Maxie may turn out to be a pretty penny of a payday.The New York Times made it clear this weekend that they agree with us, counting Simpson among “celebrity” moms with flailing careers who’ve found motherhood to be a “viable Plan B.”“Being a celebrity mom has more business opportunities than ever before,” US Weekly photo editor Peter Grossman told the Times, admitting he’s personally negotiated six-figure sales of famous newborns. “Now, it’s not just about selling your baby pics. It’s starting a clothing line or endorsing a stroller. The value of a celebrity mom has never been higher.”Photos aside, Simpson, who’s 2011-2012 income we estimate at $14 million from licensing deals and a regular gig hosting NBC’s Fashion Star, could see post-baby earning bumps from multiple revenue streams. She stands to benefit from new endorsement deals (rumors of a $3 million Weight Watchers campaign highlighting her post-partum weight loss circulated in December), expansion of her mega-successful Jessica Simpson Collection into kiddie gear and, of course a little extra action from name-dropping products to her five million Twitter followers.While an official report on Simpson’s earnings from Twitter endorsements hasn’t been made public it stands to reason she’s pulling in more than $5,000 a pop (Paula Abdul does, with just 2.2 million followers, according to numbers from Ad.ly). Lori Levine, an executive for Flying Television, an agency that regularly books talents for Twitter deals laid it all out there for the Times. “The bottom line,” she says, “Is that if it’s a reality star pushing a product, chances are they’re making money from it.”Readers: What do you think? Will we see Simpson and little Maxie signed on to a reality show deal in the next 12 months a la Tori Spelling? Are bejeweled diaper bags in the works? And what about J. Simp getting back into the studio to record an album of lullabies?One thing’s for sure: we’ve got our eyes on that Baby Bjorn.