"Best $2k I Ever Spent!" Great Moments In Silly Hats At Perez Hilton's "Mad Hatter" Birthday Party

Although we've had our, ahem, intellectual differences with Perez Hilton in the past, we'll give him the credit of acknowledging that any blogger who can turn themselves into a celebrity in their own right is clearly running an effective business. Writer, producer, publisher, self-promoter: it's a lot of hats to wear, and it should therefore come as no surprise that when Perez hit the big 3-4, he chose to celebrate with a wacky hat party. Let's see which celebrity guests didn't read the invites!

[all photos via and via]