Tori Spelling was several hours late to her own book party at Highbar the other night after getting held up at the Time Warner Center Borders signing copies of “Uncharted Territori” for 500 fans. “She would not leave until she signed everyone’s book,” said Spelling’s rep. The reality star finally got to Highbar at midnight, though the party was scheduled to end at 10:30 p.m. Signing all those copies left Spelling hungry: She ordered a Domino’s pizza during the party and wolfed down three slices.