A nude photo of singer Christina Aguilera, 27, has surfaced in the Internet.

Aguilera, sitting stark naked on a barrel, with only a headscarf, earrings and high heels on, is said to be upset on the leak of the said photo.

Aguilera's nude photo is part of a big group picture along with other artists like Pamela Anderson, who was wearing a bikini.

The controversial photo, observers believe, was taken when Aguilera worked with famed producer David LaChapelle.