The 35-year-old actor and Mollen got married in 2008, shortly after meeting on the set of rom-com 'My Best Friend's Girl'.
Biggs broke the news during his appearance on US show 'Chelsea Lately', reported E! online.
Mollen, 34, confirmed her pregnancy by posting a picture of her sonogram on Instagram, jokingly writing, "My new assistant is so lazy."
She then shared an image of four different pregnancy tests she had taken - which all showed positive.
Biggs also took to Twitter after his TV appearance to spread the word.
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