NICK'S BAD IDEA

NICK LACHEY told DAVID LETTERMAN he wishes he’d blown off the “Newlyweds” reality TV show because it helped bust up his marriage to JESSICA SIMPSON – but listen for the singer’s change of tune now that MTV’s waving million$$ to coax him and his ex to co-host a new show called…“Ex’s!” The premise: Celeb couples who’ve split expose their ongoing battles – or happy divorce. MTV sweetened the pot by offering Nick and Jessica part-ownership in the show, and they’re mulling…so stay tuned for more of Ms. Ditz’s “Chicken of the Sea” giggles.