RollinsBand makes good points, truly.
HOWEVER, this is not a snarky coworker or a stranger with a cell phone at the table next to you. It's your husbands
business partner. The work they do together affects your life, your DH, and their life. So, in this instance, passivity is key.
I can see why you asked about it. I can tell, it's happened to me. Sometimes, to get a leg up on fashion or the one-upping game, women will try to set the next bar with a fake bag. A bar you are unwilling to match (if you even worry about such a thing) because you would not stoop to the level of buying a fake. However, with an elusive and expensive item, you can't "share her joy" because you have taken the honourable route, by not buying a fake. So she may (and usually seem to always) goad you a little with her new prize. Whether it's to try to feel somehow superior, or justify her fake bag when you give up and buy one too (not that you would), either way it's a little sad.
Back to my original point... the best thing to avoid the issue. I'd bring along a fabulous bag with a sweet story (like DH gave me this on our 5th annie by the lake!) and emphasize the sweetness of it, so she understands you are not in contest.
Take the high road. The view is always better