By Rebecca Snavely, Los Angeles Times Staff Writer Ethel Mertz and Rhoda Morgenstern might not be household names like Lucy and Mary Tyler Moore, but they were always knocking on the door, ready with a smile. And if you were paying any attention, you would have noticed that over the last few years, Judy Greer
has served as Central Casting's zany go-to gal pal. She was always right there on drums for headliners Jennifer Lopez in The Wedding Planner, Jennifer Garner in "13 Going on 30," Katherine Heigl in 27 Dresses" and "Love Happens" with Jennifer Aniston. Greer took a turn as a leading lady in ABC's "Miss Guided' in 2008, and now she's taking another shot at carrying a show in a project called "I'm With Stupid" that's in development at the network. We think it's high time for a quick spin through film and TV's funniest lady sidekicks.