"Nothing to do with me, but it's very good news," the new dad's aunt reportedly said following the royal baby's arrival.
Then again, maybe Anne is simply saving her enthusiasm for her 32-year-old daughter, Zara.
After all, William's cousin is expecting her first child with her husband, rugby star Mike Tindall.
Per the BBC, the baby is due in early 2014.
Zara and Mike tied the knot in Cannongate Kirk, Scotland, in July 2011, just a few months after the Duke and Duchess of Cambridge's lavish wedding earlier that April.
On Tuesday, William and Kate left St. Mary's Hospital in London with their newborn.
As the trio posed for pictures outside, a beaming William told the press that his 1-day-old son has "got way more hair than me, thank God!"