05/18/2010 AT 02:55 PM EDT
, standing in line at the concession stand at L.A.'s ArcLight Theater before catching a late-night showing of Iron Man 2
with a male pal. The casually-dressed actress picked up a Dove ice cream bar before taking seats in one of the back rows of the balcony. But the ice cream may have proved more enticing that the movie: Theron and her pal snuck out of the theater well before it ended.