Another bitch is about to get welcomed to The O.C. As reported exclusively in today's Ask Ausiello, The Comeback's Willa Holland has been tapped to play Marissa's MIA younger sis, Kaitlin. She'll surface in early '06 and, according to Fox, "wreak havoc, turn heads and introduce a darker, edgier element" to the show. Also in today's AA: Major Gilmore Girls spoilage, breaking casting news on House and Will & Grace and another clue about the big Las Vegas death.