As Stella Tennant, Princess Di, and Fergie are descended (through illegitimate lines) several times over from the later Stuart kings of England, for interest's sake these descents are outlined in this next chart. A matter of interest is that none of these descents are shared by Prince Charles, next in line to the throne; the latest Stuart king from which he descends is James I, the father of Charles I.
Note that this is not Stella Tennant's most recent royal descent, as she apparently is also a descendant of Louis XV, King of France (again via an illegitimate child), as follows:
Louis XV, King of France (1710-1774)
by an unknown mistress had
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Emilie Adelaide Filleul (c1759-aft 1802)
by Charles Maurice de Talleyrand-Perigord, Prince de Benevento, had
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Comte Charles de Flahault de Billardrie (1785-1870)
m. 1817 Margaret Mercer Keith, Lady Nairne
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Emily Jane Mercer Elphinstone de Flahault, Lady Nairne (1819-1895)
m. 1843 Henry Petty-FitzMaurice, Marquess of Lansdowne
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Henry Charles Keith Petty-FitzMaurice, Marquess of Lansdowne (1845-1927)
m. 1869 Maud Evelyn Hamilton
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Evelyn Emily Mary Petty-FitzMaurice (1870-1960)
m. 1892 Victor Christian William Cavendish, Duke of Devonshire
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Edward William Spencer Cavendish, Duke of Devonshire (1895-1950)
m. 1917 Mary Alice Gascoyne-Cecil
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Andrew Robert Buxton Cavendish, Duke of Devonshire (b. 1920)
m. 1941 Deborah Vivien Freeman-Mitford
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Emma Cavendish (b. 1943)
m. 1963 Tobias William Tennant
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Stella Tennant (b. 1970)