Christina Aguilera sings to Mr. Perez-ident

Everyone was all-smiles at the 31st birthday party for the Gossip Guru, Perez Hilton!

Check out the video of Christina singing her version of Happy Birthday!

Related posts:

1. Christina Aguilera Holiday Shopping with son, Max
2. Christina Aguilera Golden Globe Awards
3. Christina Aguilera ‘Lift Me Up’ Hope for Haiti Now (Video)
4. Perez Hilton attacked by Will.I.Am
5. Video of Perez Hilton Will.I.Am Fight