Wow. I would blame her stylist (if she has one). Often they get stuff from their entourage and have no idea that they are fakes.
If I was given a fake bag for free from a brand I knew nothing about like Balenciaga....then i would probably carry it proudly too.....until someone told me then I'd be horrified.
Sometimes we have to remind ourselves that most celebrities don't have the free time to learn all the ins and outs of designer brands like we do on the forum.
Some of them i truly beleive are unaware that they are carrying fakes.
I'm giving Brit the benefit of the doubt......but I could be wrong