[Watch] Was LeAnn Rimes intoxicated On X-Factor USA?

Can anybody tell me what was going on with LeAnn Rimes during her performance at X-Factor USA, because to me she looked (and sounded) drunk as hell!

Joining contestant Carly Rose Sonenclar on stage for a duet of her MASSIVE hit How Do I Live, the country-pop star messed up the lyrics, played (badly) with the medley, and made herself look anything but the seasoned veteran she is.

Poor Carly Rose, it must have been hard to stay in tune when LeAnn was changing the key with every other beat of the song. I can only imagine how resentful her parents the 13-year-old(!) is feeling after missing out on winning the series. Though, to be fair, she didn't sound like the strongest singer- if the pre-LeAnn vocals were anything to go on.

LeAnn Rimes has since issued a statement claiming she was not drunk, saying: "It's a shame gossip and lies are overshadowing the performance of Carly, a very talented young girl." But if it wasn't booze, what was it? Prescription pills? Jet lag? Drugs? A fiendish (failed) plot to win sympathy-and thus votes- for Carly Rose?

Whatever it may have been, if there is a real problem here, I hope those around LeAnn will make sure she gets the help she needs.

LeAnn singing "How Do I Live" in 1999:

Thoughts?