The star-studded mother of all ensemble casts attended the WHAT TO EXPECT WHEN YOU'RE EXPECTING premiere in Los Angeles last night. Jennifer Lopez, Cameron Diaz, Elizabeth Banks, Chace Crawford, Anna Kendrick, Brooklyn Decker, Matthew Morrison, Rodrigo Santoro, Ben Falcone, Joe Manganiello, Thomas Lennon, Rebel Wilson, Wendy McLendon-Covey, and Whitney Port talked babies, fashion, and more on the black carpet.