Kate Middleton Has Gone Into Labor

Kate Middleton, the Duchess of Cambridge, has gone into labor, reports the palace.

From the BBC:

She travelled by car from the palace to St Mary's in Paddington, west London, with her husband the Duke of Cambridge.

The couple do not know the sex of their first child, who will be third in line to the throne.

...

Royal vehicles were seen at a back entrance to the hospital at about 06:00 BST, with the announcement coming from Kensington Palace an hour-and-a-half later.

We'll be standing by with more details as they're known.