Queen Elizabeth welcomes second great grandchild

Queen Elizabeth is a great grandma again!

Peter and Autumn Phillips welcomed their daughter, Isla Elizabeth Phillips, at the Gloucester Royal Hospital on Thursday, a spokesperson for the couple tells Us Weekly. Weighing in at 7 lbs., 4 oz., little Isla joins big sister Savannah, 15 months; thirteenth in line for the British throne, she is Queen Elizabeth's second great-grandchild.

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Peter was present at his second daughter's birth, the rep added. The royal family is said to be "delighted" by Isla's arrival.

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Peter, 34, is the son of Princess Anne and her first husband, Captain Mark Phillips; he and Autumn got married in May 2008 at Windsor Castle. His sister, Zara Phillips, wed rugby player Mike Tindall last summer at a wedding attended by all the royals — including Prince William and Kate Middleton plus Prince Harry, who even sang karaoke at the bash.