Theresa Elizabeth "Teri" Polo (born June 1, 1969) is an American actress. She starred as Pam Byrnes-Focker in the Meet the Parents trilogy (2000-2010). She was one of the stars of the sitcom I'm with Her (2003–2004), had a recurring role as Helen Santos on the political drama series The West Wing (2005–2006) and currently plays the lead role of police officer Stef Adams Foster in the ABC Family series The Fosters (2013–present).