In another demonstration of the symbiotic relationship between celebrities and those who make people care about them (those vile fiends), the notoriously flamboyant celeb blogger Perez Hilton celebrated his 31st birthday on Saturday in Los Angeles amidst numerous famous faces.*

Attendees of the b-day event at the Viper Room included Paris Hilton, Kim Kardashian, Spencer Pratt, Amanda Bynes, Salman Rushdie, Tara Reid and Heidi Montag. (Can you spot the odd one out?)

The undisputed highlight of the night came courtesy of pop-pixie Christina Aguilera. Clad in a leopard print body-suit, she wittily serenaded Perez, “happy birthday dear Perezident,” à la Marilyn Monroe.

The Jonas Brothers made a surprise appearance, rushing over from the Kids Choice Awards to bring out the cake and lead the “happy birthday” chant. Viva La-La Land.

*The author of this blog will refuse to comment on the obvious irony of Perez Hilton himself becoming the subject of a celebrity blog. Oh, wait . . .