Yes, she has. Mischa originally had her ears pierced when she was in her early teens, but stopped wearing earrings and let the holes close up before she started on The O.C. After that, she could only...
go to a shop and they'll pierce your ears for you
to do it your self its a bit more painful buy a pair of ear rings and push them through the scin. (make sure you have ice be hind your ear) !