How Do You Know is a 2010 romantic comedy drama film directed, written and produced by James L. Brooks. It stars Reese Witherspoon, Paul Rudd, Owen Wilson and Jack Nicholson.The film was shot in Philadelphia and Washington, D.C. It was released on December 12, 2010. It was the third film to feature Witherspoon and Rudd following 2009's Monsters vs. Aliens and 1998's Overnight Delivery.The film was both a critical and financial failure, grossing $48 million against a $100 million budget.