Making for quite the star-studded affair, celebrity blogger Perez Hilton threw a big birthday bash at The Viper Room in West Hollywood on Saturday night (March 28).

With Perez leading the charge, couples joining in on the fun included Christina Aguilera and Jordan Bratman, Paris Hilton and Doug Reinhardt, and Heidi Montag and Spencer Pratt.

plus among the 200 well-wishers attending Hilton’s 31st birthday bash were

Kim Kardashian, Amanda Bynes, Tara Reid, Ashley Tisdale, Emmy Rossum and the Jonas Brothers, who rushed by from the Kids’ Choice Awards to sing a rendition of “Happy Birthday” while presenting Perez with an autographed guitar.

Another highlight of the evening saw Miss Aguilera dress in a sexy leopard-print outfit while singing out Marilyn Monroe-style, “Happy birthday, Mr. Per-ez-ident.”

Original post by http://www.gossipgirls.com