LeAnn Rimes: Drunk on The X Factor?!

LeAnn Rimes' duet with 13-year-old Carly Rose Sonenclar on The X Factor finals last night raised eyebrows - and questions about her sobriety.

The two sang LeAnn's hit "How Do I Live" and many viewers felt Rimes' performance was a little over the top ... to put it mildly. Take a look below:

LeAnn Rimes and Carly Rose Sonenclar - How Do I Live

The Huffington Post labeled her effort “uneven and uncomfortable” and pointed out that “Rimes even gripped onto Sonenclar during the performance."

Her voice didn't seem to have its usual strength, leading some fans to speculate online that she might have been drinking prior to taking the stage.

The UK’s Daily Mail also remarked that Rimes' "bizarre" performance may have been an attempt to out-sing or upstage the young X Factor competitor.

The Hollywood Reporter said Rimes wasn't feeling well yesterday, which may explain her odd behavior ... which was either ignored or missed by the judges.

“They were shockingly amazing, so great,” said Britney Spears, who appeared to be on the verge of tears during the performance (for whatever reason).

LeAnn Rimes’ strange performance comes on the heels of her trip to rehab and her ongoing feud with Brandi Glanville escalating in recent weeks.

“It’s out of control, the way LeAnn stalks Brandi,” an insider told celeb gossip magazine Star. “Even LeAnn’s friends think it’s weird, but she can’t help herself."

"If Brandi tweets a picture of herself in a bikini, LeAnn does the same. If Brandi talks about becoming a dermatologist, LeAnn starts talking about it ... it’s really strange!”

According to Rimes, the obsession is one-sided - from the other side.

Asked about Brandi on the Tonight Show, LeAnn slammed her and her show, saying she should be "flattered that she thinks I'm so interesting that I can be a storyline."

What do you think of the duet with Carly? Just an off-night for LeAnn, or are there bigger issues at work? Or did you love her performance? Comment below!