...Kristin Cavallari was freaking out!

When the paps caught sight of the former Laguna Beach hottie outside Villa, they naturally started snapping away - which caused Kristen to start shrieking about how she couldn't see!

Compared to her friends, however, Kristen did an admirable job of maintaining her composure - one of her friends started threatening to kick one of the photogs' asses!

Of course, Kristen was hardly the only celeb at Villa - if you check out our video site, you can also see our footage of Nicky Hilton, Vin Diesel, and a newly shorn Kim Stewart arriving on the scene! (What do we think of Kim's new 'do, by the way?)