Um okay, Marc Jacobs knocked off his own LV....

he does it a lot. some of the MJ bags look very similar to the LV. one that comes to mind is the MJ Venetia which to me is a leather version of the Manhattan.
 
I agree with others, I have seen a lot of his bags take certain accents from some LV bags and use them on the MBMJ bags. I was surprised when I first noticed it, but then like someone else says, I suppose he can do whatever he wants!