A representative for the star told E! that Faris and her actor husband Chris Pratt are expecting their first child together.
The couple married in a small ceremony in Bali in 2009 after they met on the set of Take Me Home Tonight in 2007.
The actress said last October that Pratt wants "a big family", while admitting that the timing of having a family can be hard in the movie industry.
She was previously married to Ben Indra from 2004, but the couple split in 2007 and divorced the following year.
The actress features opposite Sacha Baron Cohen in upcoming comedy The Dictator.
Watch the opening scene of The Dictator below: