Christina Aguilera made celeb-blogger Perez Hilton a very happy man on Saturday night after serenading him at his 31st birthday party in Hollywood.
The singer recreated Marilyn Monroe's breathy Happy Birthday Mr. President she performed for John F. Kennedy at the Viper Room.
She sang "Happy birthday, Mr. Per-ez-ident" as celebrity pals like the Jonas Brothers and Paris Hilton looked on.
The blogger received champagne from Zac Efron and a signed guitar from the Jonas Brothers, who raced to his 31st party from the Kids' Choice Awards, where they were named Favourite Music Group.
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