Hi there,
Yes, sadly it's fake. There are many ways of confirming this, but first is the overall style, which was never made by Kate Spade. Next is the label. The font and spacing of the characcters is incorrect. Next is the lining, All kate spade fabrics are top quality and custom designed. But most important is that little tab of what appears to be vinyl with nothing on it. Authentic kate spade bags have some label inside, most commonly stamped in gold into leather. That is usually either sewn around on all four sides or is integrated into leather that surrounds the inside zipper pocket. To have that little tab just sitting there with no label is something the counterfeiters do to deceive. Next are the pointy feet at the bottom of the bag. If you see pointy feet, you're looking at a counterfeit, 100% of the time. That's a dead giveaway that it's a fake.
All that said, this is 100% counterfeit; there is no doubt whatsoever. I'm sorry if you got taken, but it's a big ole fake.
There is a website that's a bit out of date, but has excellent information about identifying the fabric labels kate spade used. Here's a link:
http://ihatecounterfeitbags.info/katespadelabels
That site is owned by the person that we all recognize as the ultimate authority in kate spade items. You'll be able to confirm that the label is indeed fake.
Wishing you the best!! Yank that listing!
Marissa