Christina María Aguilera is an American singer who appears as a pink monster in Season Four episode "Timmy 2000".
After having consumed Ritalin, Eric Cartman began developing side effects with make him see "pink Christina Aguilera monsters".
At Cartman Residence, Cartman sees a monster on Kenny's head, and proceeds to swing a pan onto Kenny, killing him.
Cartman was later cured of his side effects after consuming Ritalout.
Christina Aguilera appears as a pink bug-like creature with a purple tail and a real photo cut-out of her head.