https://www.dailymail.co.uk/tvshowbiz/article-315244/Were-Diana-Jemima-sisters.html

https://marriedwiki.com/wiki/james-rothschild

https://www.dailymail.co.uk/news/article-2294181/Zac-Goldsmith-marries-Rothschild-thatched-hut-bird-sanctuary.html

http://en.wikipedia.org/wiki/James_Goldsmith

am I the only one late to this party?

That princes Diana was daughter of Sir James Goldsmith

because Nicky Hilton is married to James Rothschild, whose sister is married to a Goldsmith.

So they must all be the same bloodline, marrying into each other's families.

Goldsmiths, Hiltons, Rothschilds, etc