The registrar who recorded the birth of Prince George is named Alison Cathcart and has been doing the job for 22 years.
She described today's duty as "a great pleasure" and said that it "cements an association with Westminster City Council and royal births in the borough that goes back decades"
"We registered the birth of the Queen and Prince Charles and Princes William and Harry so it's great to see that tradition continue," she added.
Cathcart has presided over several celebrity marriages including those of Sylvester Stallone, Joan Collins, Barbara Windsor and comedian David Walliams.
More top news
The Birmingham singer's dream ended when she lost out to girl group Four of Diamonds in Sunday's sing-off.
The racing driver beat Mercedes teammate Nico Rosberg to pole position.
Police fire tear gas on migrants as flames light up the 'jungle' camp on its final night before it is razed and its residents dispersed.