Actress is pregnant again after giving birth 10 months ago
The actress, 39, who gave birth to son Alexander in July last year, is 4 months pregnant.
Last year, Liev, 40, announced he was expecting a son during an interview.
The couple met on the set of The Painted Veil in 2006.
Naomi previously dated Australian actor Heath Ledger, who died of an accidental prescription drug overdose in January.