Olivia Wilde says people pretend not to know she's pregnant to be polite

Olivia Wilde, who is expecting her first child with fiance Jason Sudeikis, believes that people act as if they do not know she's pregnant out of some well-intentioned sense of politeness.

The 'Her' star told 'The Tonight Show' host Jay Leno that the worst thing in the world is to congratulate a non-pregnant woman on her pregnancy, and people will go to great lengths to not mention it, Us Magazine reported.

The 29-year-old actress added that unless someone's watching you give birth, they don't want to make the wrong call.