Well, not really a spy gadget but it could easily be used as one. I'm talking about the new Barbie Doll. Wait, what? Yes, it is a Barbie doll. This doll has a video camera incorporated and disguised as a necklace - very well disguised I may add. In the back of the doll you'll find a small LCD monitor, where you can watch your videos. You'll also get and USB cable of course, plus a video editing software. The doll can record up to 25 minutes of footage, enough to catch your cat eating the leftover pie, and thus proving to your entire family it wasn't you, it was Mittens all along.
Watch this awesome video for more information.