Vince Vaughn, pregnant Jennifer Connelly at 'The Dilemma' premiere
Winona Ryder, fresh off her "Black Swan" success, also made the red carpet in Chicago, as did fellow cast member Channing Tatum, with wife Jenna Dewan on his arm, director Ron Howard and Chicago-based film critic Roger Ebert, who had news of his own this week about his upcoming TV show.
Click the picture of Vaughn signing autographs, above, for more pictures from the world premiere.
"The Dilemma," a comedy about a man who sees his best friend's wife with another man, opens next Friday.
-- Christie D'Zurilla
Photos: Jennifer Connelly, left, and Vince Vaughn, right, at the world premiere of "The Dilemma" in Chicago on Jan. 6, 2011. The two are a couple in the Ron Howard comedy. Credits: Daniel Boczarski / Getty Images, left; Tannen Maury / EPA, right.