Not living, as far as I know, although if everyone of the same surname is related I could speculate my relationship to Johnny Depp

(Both he and I have an ancestor named Thurman. Look............it was worth a try...............and yes, I know, maybe therefore Uma Thurman, who is nowhere near as interesting as Johnny Depp).
But my husband has a distant cousin who is related by marriage to Chopin. That's the poshest one I've found anyway.
My grandma knew Keith Richard's Mum. Does that count?
Oh no, wait I've thought of another one. My cousin's first wife was the niece of Sylvia Sims, the actress. It's still through marriage and not blood dammit.