Others seasons of the oc??

ciao ! I am in desperate need of your help. I am french and I watched the oc, and I want to now if the season 5 of the oc has really been shot. Because I heard that Rachel Bilson will work on The oc again, in the same moment she'll work on How I met your mother. Here, in France, we have any informations about the oc. If there are other seasons of the oc, please tell me and mostra me where can I watch its.
Thank te very much ans excuse my english is a little bad.
SarahRam.