Jess and John Squeeze In

3/1/2007 12:18 PM PST

Jess and John Squeeze In

Jessica Simpson, wearing dark extensions, with John Mayer wearing one of Patricia Heaton's harried hairdos from "Everybody Loves Raymond," showed up for the Level Vodka bash at New York hotspot Stereo.

The appearance of the twosome set off a photog frenzy in front of the club. And though Simpson is a spokesklutz for Pizza Hut, party organizers were seen carrying eight non-Hut pizzas into the party.