The couple already have a daughter, Sophia, who is 2 1/2 years old.
Cast as lovers in 2001's Pinero, Bratt, 41 and Soto, 38, began their romance when, both unattached, they met up for the movie's premiere at the Montreal World Film Festival.
"It started as a friendship, and little by little, they found they had something in common," Soto's friend Nicky Corello told PEOPLE in 2002.
The couple wed in a small ceremony overlooking the Pacific Ocean in Bratt's hometown of San Francisco on April 13, 2002. Before marrying Soto, the former Law and Order heartthrob dated Julia Roberts for four years. That ended in 2001.