Emily Mortimer revealed her most embarrassing experience trying out for a role at Monday’s Artios Awards at XL Nightclub. She auditioned for the femme fatale role in “The Black Dahlia” 12 weeks after she had her third child. When a casting director told Brian De Palma that Emily had just had a baby, she lied that she’d given birth many months earlier. She added, “I would have gotten away with it until I was asked when my daughter’s birthday was. I blanked . . . under the pressure of the lie.” Needless to say, she didn’t get the part.