Upon closer inspection... Yeah, you're right.
Also, the background looks like the first world in
New Super Mario Bros. U. You know, with that weird mountain in the background?
Edit: I just realized that the background is that of this game's version of the Battlefield (the bushes match up, as does the mountain):
Also, it's not the AR model from
Kid Icarus: Uprising. Just as a comparison, here's her official artwork for the game:
Here's her AR card:
And lastly, here's a closer look at Palutena in the supposed "leaked" screenshot:
Look at the little gold trinkets along her waist... and you'll notice a certain familiar
Mario power-up among them that's not on Palutena in KIU. If this WERE a fake, why would whoever made this go so far as to add such a minor, barely noticeable detail like this?