How do you almost ruin your own MTV Video Music Awards afterparty? By starving your celebrity guests, if you’re the House of Hype in Beverly Hills.“I came here because they were supposed to serve us free dinner, but they didn’t, so I am about to bounce!” grumbled Katy Perry on Sunday. She’d performed at the show earlier and taken home three VMA trophies, and obviously didn’t get a chance to eat along the way. And why would she, when the invite to the SLS Hotel for the marketing firm’s Hot 100 Dinner promised a 9 p.m. start for dinner? But now it was 11:15 p.m., and the main course was nowhere in sight as people slurped down Red Bull and vodka and prayed for some protein. “If there’s no food, I am going to Jack in the Box,” added Perry, who relied on her bodyguard to rustle up some food. Apparently he succeeded, as the singer and her entourage hung out for the dance party that followed the very late-arriving meal. Jamie Foxx gave a surprise performance, much to the delight of Rose McGowan, Jonah Hill, Mark Salling, Malin Akerman and Britney Spears, who wasn’t at all hungry. Seems at least one pop princess knows to stop at a fast-food joint before hitting the afterparty.