Shar Jackson seems happy as a clam now that she’s seven weeks pregnant with Kevin Federline’s newest baby. What? That’s right. Cindy Adams takes delight today in announcing that K-Fed’s “on-again-off-again-and-for-sure-lately very on-again romance” with Jackson has been productive (or counterproductive, depending). “At the instant I write this,” she says, “he doesn’t know.” Forget Vincent Gallo’s sperm – Federline’s seed is the product to sell on eBay. Semen First Class.