Britney Spears VMA Nightmare....

Britney Spears is in Las Vegas– inside a $25,000-a-night villa.

The pop star has arrived in Las Vegas for her much anticipated opening performance on Sunday's MTV Video Music Awards and has already checked in to the Palms Casino Resort. Clad in jeans, a white shirt, floppy hat and sunglasses, Spears touched down in Las Vegas on Friday afternoon with pal Alli Sims and another girlfriend and went straight to the Palms Sky Villa, a luxury suite equipped with pop-up plasma TVs, a rotating bed and views of the Strip. (Sons Sean Preston and Jayden James were spending the weekend in dad Kevin Federline's care.)

But her arrival didn't come off without a hitch – after her flight was forced to circle the Las Vegas airport a few times and her pit stop at the hotel, she was a couple of hours late for rehearsal with illusionist Criss Angel.

Still, says a source who saw her rehearse in the Pearl Theater, "She looks great. She's going to blow people away."