What is dripping down Christina Aguilera's leg?

We were so distracted by Christina Aguilera's epic (and sorta inappropriate) cleavage when she performed at Etta James' funeral yesterday, we didn't think to look down and notice the strange things going on further south.

Poor Christina must be totally mortified after photos of the singer with a mysterious stream of …we don't even want to speculate what running down her leg… have gone viral on the web.

Best case scenario, it's her spray tan getting all sweaty and diluted. Worst case scenario… well, we're not going to go there. But you can imagine what's being suggested on less classy sites than ours.