good buy - i have the hobo in bordeaux from the same range that Liv Tyler has. Think its possibly 2004 or something - a good while back. I saw my one being carried by Liv at a Marc Jacobs fashion show when she was pregnant (so that perhaps dates it?) - she's with Kate Hudson, maybe if you try a Liv Tyler picture page you'll see it.
Its def not fake, is Marc Jacobs couture (not M by MJ) and if you search the boards someone posted about your bag a while back, desperately looking for it, after seeing it on Nicole Ritchie. (maybe search for nicole ritchie marc jacobs or something)
I also spotted your bag being toted by Christine Taylor in Arrested Development series 2!! (lol, I'm sad, but it was exciting!)
The leather on these bags is beautiful, and the suede accents are lovely. I love mine, it's a great bag and the bordeaux will never go out of style. Enjoy it!!