Looks like we're going to have to wait until tomorrow night to see how well Lilly Scott and Haeley Vaughn do this week's American Idol. The two ladies, who made it past last week's elimination, were initially slated to sing this evening, but will now be showcasing their pipes tomorrow night instead, reports EW.com. Evidently, some sort of unnamed medically related malady is preventing Crystal Bowersox from performing tonight, so the guys are getting the nod tonight instead. And then on Thursday night, we'll find out which contestants America decides to keep.