Palace officials say Prince William's wife, Kate, has been admitted to the hospital in the early stages of labor.
In a brief statement, Kensington Palace said: "Her Royal Highness the Duchess of Cambridge has been admitted this morning to St Mary's hospital, Paddington, London, in the early stages of labour.
"The duchess travelled by car from Kensington Palace to the Lindo wing at St Mary's hospital with the Duke of Cambridge."
The duchess is expected to give birth in the private wing, where Princess Diana gave birth to William and his younger brother, Prince Harry.
The baby will be third in line for the British throne - behind Princes Charles and William - and is anticipated eventually to become king or queen.
BELFAST, Northern Ireland (AP) — President Barack Obama will appeal to Northern Ireland's youth to sustain their peace in his first opportunity to highlight the role the United States has played helping bring about reconciliation in the country.
Obama arrived at Belfast on Monday morning. After his Belfast speech he will attend a two-day summit of the Group of Eight industrial economies.
Later Monday he was to meet on the sidelines of the summit with Russian President Vladimir Putin. Topics for the two leaders range from Syria to arms control. Russia has criticized Obama's decision to arm Syrian rebels and has dismissed U.S. claims that President Bashar Assad's regime has used chemical weapons against Syrians.
Russia is a member of the G-8. So are Canada, Japan, Britain, France, Italy and Germany.