BEGUN, THE MELTDOWN HAS

That whole N-bomb debacle is continuing to haunt Omarosa Manigault-Stallworth. The Apprentice diva walked off the set of ABC's Jimmy Kimmel Live last night after she allegedly spotted a lie-detector machine on the set. According to a Kimmel spokeswoman, the equipment was set up for a comedy bit with show regular Uncle Frank and was unrelated to Om's appearance. "The producers attempted to reassure [her] that they did not intend to ask her to take a lie-detector test," says the rep, "[but] she became upset and left." Kimmel kept the show going despite the sudden guest shortage, and even brought a producer onstage to explain what happened. "Apparently, her 15 minutes ended the second before I introduced her," Kimmel later cracked. "I felt like Jessica Simpson standing alone at the airport." Maybe Omatrocious was still reeling from some bad news she received earlier that day. For more on that, read on...