MADRID, Spain - Spain rejoiced Monday in the news that Princess Letizia was pregnant, but a key question was unanswered: Will it be a boy or a girl?

A boy would be second in line for the throne, after 37-year-old Felipe, who is King Juan Carlos' third and only son.

If the baby is a girl, however, she would inherit the throne after any sons Felipe and Letizia might have in the future, as the Spanish constitution allows a female heir to the throne only if she has no brothers.

The Spanish Royal Palace announced Sunday that the 32-year-old princess, a former anchorwoman for Spanish national television, was due in November.

Many Spanish newspapers suggested the royal succession rule of boy before girl was unfair and old-fashioned.

Prime Minister Jose Luis Rodriguez Zapatero reiterated his plan to reform the constitution and remove the gender rules on hereditary succession. The reform is being studied by the country's State Council.