The Mail revals, "the splotchy skin was made all the more obvious by Keira's burgundy gown."

Keira Knightley suffered a fake tan fail at the premiere of "A Dangerous Method in London," on the red carpet and of course, the paparazzi caught it.

Christina Aguilera feels Keira's pain - she also had the same embarrassing issue at Etta James funeral this week.

Patches of fake tan were visible on Knightley's back, For Christina, it ran down her leg.

The UK Daily Mail reports on Keira's fake tan fail, noting that "the splotchy skin was made all the more obvious by Keira's burgundy gown, whose backless panel only served to attract attention to her slip-up."

Oops!

See some of the photos below.

(Images: WENN)