Yeah, shaving cream is right. Authenticity, authenschmicity. The deal is this. Whipped cream doesn't have what every whipped-cream-covered girl needs during a parade: staying power. Barbasol rocks in this department. (In fact, the next day, I found some clumps of it on the floor of Whip It!, dried, yes, but still holding their shape. Amazing!)
Besides, whipped cream is something Barbasol isn't, namely, a dairy product. See, we did put some whipped cream on Felicia's fingers for the more ... edible ... shots. It wasn't long before her fingers got a little ... funky. We had to wash 'em off. Think what it would've been like if her whole body had been dairy-covered.
And as for "authenticity" ... for your information, during the original photo shoot for the Whipped Cream & Other Delights photo session, whipped cream was not used. Shaving Cream was.
I don't know what brand, but my money's on Barbasol.