Hello Granny

Which 3rd generation royal has an initially funny (but gradually grating) habit of unrolling friends' banknotes when doing coke to say "Hello Granny!" to the Queen's portrait, before re-rolling it and hoofing their line?

Source: http://www.popbitch.com

Which 3rd generation royal has an initially funny (but gradually grating) habit of unrolling friends’ banknotes when doing coke to say “Hello Granny!” to the Queen’s portrait, before re-rolling it and hoofing their line?

Queen Elizabeth’s Grandchildren

Peter Phillips (born 1977)
Zara Philips (born 1981)
Prince William (born 1982)
Prince Harry (born 1984)
Princess Beatrice (born 1988)
Princess Eugenie (born 1990)
Lady Louise Windsor (born 2003)
James, Viscount Severn (born 2007)