The Erin Brockovich star, 39, and Moder, 37, welcomed twins Phinnaeus Walter and Hazel Patricia in November 2004--two years after their Independence Day marriage.
The New York Post reports Roberts was pleasantly surprised to discover she was pregnant again and will give birth in the summer of 2007.
The couple met on the set of The Mexican in 2000, when both were with their respective partners, actor Benjamin Bratt and makeup artist Vera Steinberg.
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