It looks like mom-to-be Sydney Bristow is already down one baby-sitter. Greg Grunberg confirms in today's fresh Ask Ausiello that, after five seasons as Agent Weiss, he'll exit the show this fall. For more on that development, as well as exclusive scoop on Gilmore Girls, Lost, The O.C. and more, click on over to AA as soon as you're done reading Entertainment News! (C'mon, admit it: You missed these shameless plugs.)