It's probably going to take more than a sore throat to stop Lauren Alaina. A report that the 16-year-old may not be able to sing in the American Idol finals tonight, thereby paving the way for Haley Reinhart's return, is "highly exaggerated," a show source assures E! News. But, alas, they're not out of the woods yet. Haley is standing by, just in case Lauren can't go on, an insider tells us. The finalists are supposed to sing three songs tonight, but she struggled through her second number during rehearsal and was unable to practice her third. The source says...