Plot: Dancing with the Stars, Racist TV, Diddy, Katie Couric; Sizzler: Lindsay Lohan needs underpants, Kirsten Dunst’s sex stories, Brad Pitt marriage demands, 50 Cent gets arrested; Paul F. Tompkins Celebrity Defender: Paris Hilton drunk driving; In Case You Missed It: Weatherman freaks out over cockroach, paparazzi laugh at Jamiraqai, Martha Stewart licks David Letterman’s blood, Nicole Ritchie on Tyra, The Week in _itney: Britney, Whitney & Jitney; Best Week Ever: Little Richard