It looks as though things are starting to get heated over at the US version of X Factor, as Demi Lovato and Simon Cowell started quarrelling last night over the quality of one of Cowell’s acts remaining in the competition. When the boy band Emblem 3 were about to start their performance of Bruno Mars’ ‘Just The Way You Are,’ Lovato grabbed his mic off of him and finished his introduction with her own cheeky take on what viewers were about to see. As Simon started the introduction, Demi interrupted, saying that they would be “singing a very predictable song, they are going to stand on stage…”

As she giggled, Simon took the mic back off her, threatening to send her to the naughty corner. After the performance, Demi continued with her harsh criticisms of Emblem3, saying “You guys did great, but it was not the best. I used to really like you guys but to me I feel like it is a downgraded version of the Jonas Brothers five years ago.” Ouch! Cowell was far from happy at Demi’s words and told her “I have to say that was incredibly dumb what you just said actually.”

Even host Khloe Kardashian was taken aback at how “feisty” Demi Lovato had become and asked her if maybe she had just a tiny bit of a crush on one of the boys. Demi’s reply? “Of course, but I am not telling you which one.” Crikey!