How Do You Know is a 2010 American romantic comedy film directed, written and produced by James L. Brooks, and starring Reese Witherspoon, Owen Wilson, Paul Rudd and Jack Nicholson in his final film role to date. It was the third film to feature Witherspoon and Rudd following Overnight Delivery and Monsters vs. Aliens. The plot follows softball player Lisa (Witherspoon), who is caught in a love triangle between two men—the charming baseball player Matty (Wilson) and George (Rudd), a businessman who is charged for stock fraud.

James Lawrence Brooks is an American director, producer, screenwriter and co-founder of Gracie Films. He co-created the sitcoms The Mary Tyler Moore Show, Taxi, and The Simpsons and directed the films Terms of Endearment (1983), Broadcast News (1987), and As Good as It Gets (1997). He received numerous accolades including three Academy Awards, 21 Emmy Awards, and a Golden Globe Award.