updated 03/30/2012 AT 12:20 PM ET
•originally published 03/30/2012 AT 12:30 PM ET
The Queen is a great grandmother once again!
Her grandson Peter Phillips and wife Autumn welcomed a baby girl on Thursday at Gloucestershire Royal Hospital, according to Buckingham Palace.
“Isla Elizabeth Phillips weighed 7 lbs. and 4 oz. and Mr. Peter Phillips was present at the birth,” the Palace said in a statement Friday.
The newborn will be the 13th in line to the British throne, after her sister Savannah, 15 months.