Prince William and Kate mark anniversary waiting for Royal Baby #2

LONDON – Prince William and the Duchess of Cambridge are marking their fourth wedding anniversary while waiting for the birth of their second child.

The former Kate Middleton is expected to give birth in the coming days. Palace officials have said she is due in late April.

Parking restrictions outside the private Lindo Wing of St. Mary’s Hospital where she is expected to give birth were extended for five more days Wednesday as the media and royal fans gather.

READ MORE: Prep underway at hospital Kate Middleton will give birth at

Officials had initially imposed the restrictions until April 30 but have now reserved them until May 5.

William and Kate celebrated their anniversary at Kensington Palace. Here’s a look back at the royal couple over the years:

Their first child, Prince George, was born at the Lindo Wing in 2013.

Take a trip through history with these royal babies of the past.