The stunning actress - who is rumoured to be romantically involved with married father-of-four Balthazar Getty - admits while acting was always her dream, she did consider a different career option.
She said: "I wanted to be an archaeologist. I'd probably have something to do with art or something, but to be honest I never really allow myself to think about anything else."
Ah yes, joining the ranks of other top celebrities such as Shakira and Scarlett Johansson. Yes, it's good to be. . . . .an archaeologist.
Artist's conception of what Sienna Miller may have looked like:
Ummmm. . . as an archaeologist.