According to reports in their home country, Penelope is expecting the couple's second child.
TV station Antena 3 claims the Oscar-winning actress is three months along with a little brother or sister for the couple's 17-month-old son Leo.
There has been no confirmation from the notoriously private couple, who confirmed Penelope's first pregnancy when she was four-and-a-half months gone.
The raven-haired beauty has spoken on more than one occasion about her desire to expand her family.
"Los Angeles isn't the place I want to bring up my children," she recently said – suggesting that more little ones might be on the agenda.
Thirty-eight-year-old Penelope married 43-year-old Javier in a secret ceremony in the Bahamas in July 2010.
They first met on the set of film Jamon Jamon in 1992 when Penelope was 18 and Javier was 22.
But is wasn't until they worked together on Woody Allen's Vicky Christina Barcelona 15 years later that love blossomed.