X Factor's James Arthur accused of copying YouTube star
James impressed all four judges on the show with his twist on the LMFAO tune, which was almost unrecognisable from the original.
Gary Barlow said: “You turned that song on its head. It’s a silly dance song but you gave those lyrics meaning tonight.”
He added: “This wasn’t the performance of the night, it was the performance of the series so far.”
And Louis Walsh enthused: "What a brilliant interpretation. You are a real professional, you had a tough week but when you get on that stage you own it.”
But fans of a YouTube star named Noah, who has 21,688 followers on Twitter, quickly noted that James' version of the dance track sounded very familiar.
Noah's cover of Sexy And I Know It has had over 13 million views on YouTube and puts the same indie twist on the song.
One angry fan wrote: "All work is done by Noah and James gets the fame! This makes me feel sick in my stomach!"
Another said: "It just made me mad, that half Europe will sing a rendition you made...because it will now land all over the uk that sucks!"
Though James didn't mention 18-year-old Noah when receiving praise for his version of the track from the judges, he did take to Twitter to thank him.
James, 24, tweeted: "@only1noah thnx for the inspiration Noah! the Xfactoruk team loved your version and asked me to put a spin on your spin + fatboyslim feel x."
And there were obviously no hard feelings, as Noah replied: "Thx Gr8 job!"
And some of Noah's fans were rather pleased his cover got recognition by such a huge TV show.
Watch Noah's cover of Sexy And I Know It...