Okay, so I just finished re-organizing the pics. I replaced some with HQs and added new ones. I separated too the pics of her leaving Perez’s party and at Villa Lounge. Enjoy!

Arriving

Inside

Leaving The Viper Room

At Villa Lounge

Gallery Links:

• Perez Hilton’s 31st Birthday Party – Arriving (March 28)
• Perez Hilton’s 31st Birthday Party – Inside (March 28)
• March 28 – Leaving The Viper Room with Jordan
• March 28 – At Villa Lounge in West Hollywood with Jordan

Taking a cue from Hollywood’s most enduring icon, Marilyn Monroe, Christina Aguilera hit the Sunset Strip on Saturday night to toast the town’s reigning king of gossip, Perez Hilton. Rocking a leopard print body-suit, fish nets and black knee-high boots, the rarely seen pop star (with her husband Jordan Bratman in tow) made a surprise appearance at L.A.’s famed Viper Room, where, following a fierce performance of “Lady Marmalade” (the 2001 remake version), she serenaded the celebrity blogger and birthday boy with a sultry “happy birthday, dear Perez-ident.”

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Caption: Christina Aguilera heads to Perez Hilton’s birthday party rehearsal at the Viper Room in Hollywood, California.

Description: Christina’s full performance of her hit song Lady Marmalade live at Perez Hilton’s 31st birthday party.

Description: Christina Aguilera sings “Happy Birthday” to Perez Hilton during his 31st Birthday celebration at Viper Room.

Update: Added a different angle one.

Check out this video of Ashley Tisdale commenting on Christina’s performance at Perez’s birthday party.

Description: Christina Aguilera performs at Perez Hilton’s birthday party in West Hollywood.

For someone who mocks celebrities on his popular blog, Perez Hilton sure has a lot of famous friends.

Christina Aguilera, the Jonas Brothers, Paris Hilton and Kim Kardashian were among some 200 well-wishers who attended the gossip king’s 31st birthday party Saturday night.

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