Through her Savoy line, Princess Michael is also a direct descendant of King Philip II of Spain and his third wife Elisabeth, daughter of King Henry II of France and Catherine de Medici.
The Duke of Clarence, Edward's brother and the future William IV, had 10 illegitimate children with his long-term mistress. They were openly acknowledged and used the surname Fitzclarence. So, if Edward and Julie had had any children, I doubt it would have been kept secret. AFAIK she had no children with her husband either, so it seems likely that she wasn't able to have children.
Yes, both Princess Michael of Kent and Princess Mafalda descended from Prince Luigi Vittorio of Savoy-Carignano and his wife Princess Christine of Hessen-Rheinfels-Rotenburg, who were also parents of Princess de Lamballe.
Here is her line:
Prince Luigi Vittorio of Savoy-Carignano (1721-1778)
I
Princess Gabrielle of Savoy-Carignano (1748-1828)
I
Prince Franz Josef von Lobkowicz (1772-1816)
I
Princess Gabrielle von Lobkowicz (1793-1863)
I
Prince Vincenz Carl von Auersperg (1816-1867)
I
Princess Marie Gabrielle Eleonore von Auersperg (1855-1933)
I
Princess Marie Hedwig von Windisch-Graetz (1878-1918)
I
Countess Marianne Szápáry de Muraszombat (1911-1988)
I
Princess Michael of Kent (b.1945)
Interestingly, David Cameron (Former British Prime Minister) descends from King William IV and his mistress Dorothea Jordan through their illegitimate daughter Lady Elizabeth FitzClarence (later Elizabeth Hay, Countess of Erroll). David Cameron is the fourth great-grandson (great, great, great, great grandson) of Countess of Erroll. This makes Cameron fifth cousin twice removed to Queen Elizabeth II.
I don't know if it has been said as i'm new to the forum, but
Current Prime Minister Boris, is also a fifth cousin three times removed to Queen Elizabeth II and 8th cousins to his predecessor Cameron.
I'm interested in French-Canadian genealogy (particularly Quebec) and when I was at Ancestry.com I read Camilla shares ancestors with... Celine Dion and Madonna.
A fuller explanation of Camilla's genealogy can be found at www.wargs.com/royal/camilla.html
I wonder if, because of the scarcity of early settlers in Quebec, if Camilla and I might be related. Maybe that explains my "Material Girl" tendencies!